Add UNO Show 'Em No Mercy game mode

168-card deck with new card types (Skip Everyone, Discard All,
Wild Reverse Draw Four, Wild Draw Six/Ten, Wild Color Roulette),
draw stacking, draw-until-playable, mercy elimination at 25 cards,
and optional 7-0 hand swap/rotation rule. Works in both solo and
multiplayer. Includes blackjack max player increase to 4.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

internal/plugin/blackjack.go

@@ -279,8 +279,8 @@ func (p *BlackjackPlugin) handleBlackjack(ctx MessageContext) error {
 				return p.SendReply(ctx.RoomID, ctx.EventID, "You're already at the table!")
 			}
 		}
-		if len(table.players) >= 2 {
-			return p.SendReply(ctx.RoomID, ctx.EventID, "Table is full (max 2 players).")
+		if len(table.players) >= 4 {
+			return p.SendReply(ctx.RoomID, ctx.EventID, "Table is full (max 4 players).")
 		}
 
 		if !p.euro.Debit(ctx.Sender, bet, "blackjack_bet") {
@@ -289,13 +289,20 @@ func (p *BlackjackPlugin) handleBlackjack(ctx MessageContext) error {
 
 		table.players = append(table.players, &bjPlayer{UserID: ctx.Sender, Bet: bet})
 		name := p.bjDisplayName(ctx.Sender)
+
+		if len(table.players) >= 4 {
 			_ = p.SendMessage(ctx.RoomID,
 				fmt.Sprintf("🃏 **%s** joins the table! Bet: €%d\nTable is full — dealing!", name, int(bet)))
-
 			if table.joinTimer != nil {
 				table.joinTimer.Stop()
 			}
 			p.startRound(ctx.RoomID, table)
+		} else {
+			remaining := len(table.players)
+			_ = p.SendMessage(ctx.RoomID,
+				fmt.Sprintf("🃏 **%s** joins the table! Bet: €%d (%d/4 players — `!blackjack deal` to start now)",
+					name, int(bet), remaining))
+		}
 		return nil
 	}
 
@@ -458,15 +465,16 @@ func (p *BlackjackPlugin) findPlayer(table *bjTable, userID id.UserID) *bjPlayer
 
 func (p *BlackjackPlugin) handleHit(ctx MessageContext) error {
 	p.mu.Lock()
-	defer p.mu.Unlock()
 
 	table, exists := p.tables[ctx.RoomID]
 	if !exists || table.phase != "playing" {
+		p.mu.Unlock()
 		return nil
 	}
 
 	player := p.findPlayer(table, ctx.Sender)
 	if player == nil || player.Done {
+		p.mu.Unlock()
 		return nil
 	}
 
@@ -477,48 +485,70 @@ func (p *BlackjackPlugin) handleHit(ctx MessageContext) error {
 		player.Bust = true
 		player.Done = true
 		name := p.bjDisplayName(player.UserID)
-		_ = p.SendMessage(ctx.RoomID,
-			fmt.Sprintf("💥 **%s** busts with %s (%d)!", name, handStr(player.Hand), v))
-		p.checkAllDone(ctx.RoomID, table)
+		msgs := []string{fmt.Sprintf("💥 **%s** busts with %s (%d)!", name, handStr(player.Hand), v)}
+		allDoneMsgs := p.collectAllDone(ctx.RoomID, table)
+		p.mu.Unlock()
+		for _, m := range append(msgs, allDoneMsgs...) {
+			_ = p.SendMessage(ctx.RoomID, m)
+		}
 		return nil
 	}
 
 	if v == 21 {
 		player.Done = true
 		name := p.bjDisplayName(player.UserID)
-		_ = p.SendMessage(ctx.RoomID,
-			fmt.Sprintf("**%s** has 21! %s", name, handStr(player.Hand)))
-		p.checkAllDone(ctx.RoomID, table)
+		msgs := []string{fmt.Sprintf("**%s** has 21! %s", name, handStr(player.Hand))}
+		allDoneMsgs := p.collectAllDone(ctx.RoomID, table)
+		p.mu.Unlock()
+		for _, m := range append(msgs, allDoneMsgs...) {
+			_ = p.SendMessage(ctx.RoomID, m)
+		}
 		return nil
 	}
 
-	_ = p.SendMessage(ctx.RoomID, p.renderTable(table, false))
+	msg := p.renderTable(table, false)
+	p.mu.Unlock()
+	_ = p.SendMessage(ctx.RoomID, msg)
 	return nil
 }
 
 func (p *BlackjackPlugin) handleStand(ctx MessageContext) error {
 	p.mu.Lock()
-	defer p.mu.Unlock()
 
 	table, exists := p.tables[ctx.RoomID]
 	if !exists || table.phase != "playing" {
+		p.mu.Unlock()
 		return nil
 	}
 
 	player := p.findPlayer(table, ctx.Sender)
 	if player == nil || player.Done {
+		p.mu.Unlock()
 		return nil
 	}
 
 	player.Done = true
 	name := p.bjDisplayName(player.UserID)
-	_ = p.SendMessage(ctx.RoomID, fmt.Sprintf("**%s** stands at %d.", name, player.value()))
-	p.checkAllDone(ctx.RoomID, table)
+	msgs := []string{fmt.Sprintf("**%s** stands at %d.", name, player.value())}
+	allDoneMsgs := p.collectAllDone(ctx.RoomID, table)
+	p.mu.Unlock()
+	for _, m := range append(msgs, allDoneMsgs...) {
+		_ = p.SendMessage(ctx.RoomID, m)
+	}
 	return nil
 }
 
 // checkAllDone checks if all players are done and triggers the dealer. Must be called with p.mu held.
 func (p *BlackjackPlugin) checkAllDone(roomID id.RoomID, table *bjTable) {
+	msgs := p.collectAllDone(roomID, table)
+	for _, m := range msgs {
+		_ = p.SendMessage(roomID, m)
+	}
+}
+
+// collectAllDone is like checkAllDone but returns messages instead of sending them.
+// This allows callers to release the mutex before sending. Must be called with p.mu held.
+func (p *BlackjackPlugin) collectAllDone(roomID id.RoomID, table *bjTable) []string {
 	var waiting []string
 	for _, pl := range table.players {
 		if !pl.Done {
@@ -527,14 +557,12 @@ func (p *BlackjackPlugin) checkAllDone(roomID id.RoomID, table *bjTable) {
 	}
 
 	if len(waiting) > 0 {
-		_ = p.SendMessage(roomID,
-			fmt.Sprintf("⏳ Waiting on: **%s**", strings.Join(waiting, "**, **")))
-		return
+		return []string{fmt.Sprintf("⏳ Waiting on: **%s**", strings.Join(waiting, "**, **"))}
 	}
 
 	// All players done — stop timers and go to dealer
 	p.stopRoundTimers(table)
-	p.playDealer(roomID, table)
+	return p.collectDealer(roomID, table)
 }
 
 // startRoundTimer starts a shared timeout for the round plus reminder nudges. Must be called with p.mu held.
@@ -631,6 +659,14 @@ func (p *BlackjackPlugin) stopRoundTimers(table *bjTable) {
 
 // playDealer plays the dealer hand. Must be called with p.mu held.
 func (p *BlackjackPlugin) playDealer(roomID id.RoomID, table *bjTable) {
+	msgs := p.collectDealer(roomID, table)
+	for _, m := range msgs {
+		_ = p.SendMessage(roomID, m)
+	}
+}
+
+// collectDealer is like playDealer but returns messages. Must be called with p.mu held.
+func (p *BlackjackPlugin) collectDealer(roomID id.RoomID, table *bjTable) []string {
 	// Check if all players busted
 	allBust := true
 	for _, pl := range table.players {
@@ -652,10 +688,18 @@ func (p *BlackjackPlugin) playDealer(roomID id.RoomID, table *bjTable) {
 		}
 	}
 
-	p.resolveRound(roomID, table)
+	return p.collectResolveRound(roomID, table)
 }
 
 func (p *BlackjackPlugin) resolveRound(roomID id.RoomID, table *bjTable) {
+	msgs := p.collectResolveRound(roomID, table)
+	for _, m := range msgs {
+		_ = p.SendMessage(roomID, m)
+	}
+}
+
+// collectResolveRound resolves the round and returns messages. Must be called with p.mu held.
+func (p *BlackjackPlugin) collectResolveRound(roomID id.RoomID, table *bjTable) []string {
 	table.phase = "done"
 	dealerValue, _ := handValue(table.dealer)
 	dealerBust := dealerValue > 21
@@ -738,7 +782,7 @@ func (p *BlackjackPlugin) resolveRound(roomID id.RoomID, table *bjTable) {
 		table.joinTimer.Stop()
 	}
 	delete(p.tables, roomID)
-	_ = p.SendMessage(roomID, sb.String())
+	return []string{sb.String()}
 }
 
 // ---------------------------------------------------------------------------

internal/plugin/uno.go

@@ -78,6 +78,14 @@ const (
 	unoDrawTwo
 	unoWildCard
 	unoWildDrawFour
+	// No Mercy card types
+	unoSkipEveryone      // colored — skips all other players
+	unoDrawFour          // colored Draw Four (NOT wild)
+	unoDiscardAll        // colored — discard all of that color from hand
+	unoWildReverseDraw4  // wild — reverse + draw 4 + color change
+	unoWildDrawSix       // wild — draw 6
+	unoWildDrawTen       // wild — draw 10
+	unoWildColorRoulette // wild — next player flips until chosen color
 )
 
 func (v unoValue) String() string {
@@ -94,6 +102,20 @@ func (v unoValue) String() string {
 		return "Wild"
 	case v == unoWildDrawFour:
 		return "Wild Draw Four"
+	case v == unoSkipEveryone:
+		return "Skip Everyone"
+	case v == unoDrawFour:
+		return "Draw Four"
+	case v == unoDiscardAll:
+		return "Discard All"
+	case v == unoWildReverseDraw4:
+		return "Wild Reverse Draw Four"
+	case v == unoWildDrawSix:
+		return "Wild Draw Six"
+	case v == unoWildDrawTen:
+		return "Wild Draw Ten"
+	case v == unoWildColorRoulette:
+		return "Wild Color Roulette"
 	default:
 		return "?"
 	}
@@ -101,7 +123,10 @@ func (v unoValue) String() string {
 
 func (v unoValue) isAction() bool {
 	return v == unoSkip || v == unoReverse || v == unoDrawTwo ||
-		v == unoWildCard || v == unoWildDrawFour
+		v == unoWildCard || v == unoWildDrawFour ||
+		v == unoSkipEveryone || v == unoDrawFour || v == unoDiscardAll ||
+		v == unoWildReverseDraw4 || v == unoWildDrawSix ||
+		v == unoWildDrawTen || v == unoWildColorRoulette
 }
 
 type unoCard struct {
@@ -109,8 +134,14 @@ type unoCard struct {
 	Value unoValue
 }
 
+func (c unoCard) isWild() bool {
+	return c.Value == unoWildCard || c.Value == unoWildDrawFour ||
+		c.Value == unoWildReverseDraw4 || c.Value == unoWildDrawSix ||
+		c.Value == unoWildDrawTen || c.Value == unoWildColorRoulette
+}
+
 func (c unoCard) Display() string {
-	if c.Value == unoWildCard || c.Value == unoWildDrawFour {
+	if c.isWild() {
 		return fmt.Sprintf("%s %s", unoWild.Emoji(), c.Value)
 	}
 	return fmt.Sprintf("%s %s", c.Color.Emoji(), c.Value)
@@ -118,14 +149,14 @@ func (c unoCard) Display() string {
 
 // DisplayWithColor shows a wild card with its chosen color.
 func (c unoCard) DisplayWithColor(chosenColor unoColor) string {
-	if c.Value == unoWildCard || c.Value == unoWildDrawFour {
+	if c.isWild() {
 		return fmt.Sprintf("%s %s", chosenColor.Emoji(), c.Value)
 	}
 	return c.Display()
 }
 
 func (c unoCard) canPlayOn(top unoCard, topColor unoColor) bool {
-	if c.Value == unoWildCard || c.Value == unoWildDrawFour {
+	if c.isWild() {
 		return true
 	}
 	return c.Color == topColor || c.Value == top.Value
@@ -190,6 +221,12 @@ type unoGame struct {
 	startedAt   time.Time
 	done        bool // set true when game ends — prevents double-completion
 
+	// No Mercy mode
+	noMercy       bool
+	sevenZeroRule bool
+	stackTotal    int // cumulative draw penalty during stacking
+	stackMinValue int // minimum draw value to stack (0 = not stacking)
+
 	idleTimer    *time.Timer
 	warningTimer *time.Timer
 }
@@ -211,7 +248,12 @@ func (g *unoGame) draw(n int) []unoCard {
 
 func (g *unoGame) reshuffleDiscard() {
 	// Rebuild deck from cards not in play
-	fresh := newUnoDeck()
+	var fresh []unoCard
+	if g.noMercy {
+		fresh = newNoMercyDeck()
+	} else {
+		fresh = newUnoDeck()
+	}
 	inPlay := make(map[unoCard]int)
 
 	for _, c := range g.playerHand {
@@ -361,7 +403,7 @@ func (p *UnoPlugin) Name() string { return "uno" }
 
 func (p *UnoPlugin) Commands() []CommandDef {
 	return []CommandDef{
-		{Name: "uno", Description: "Solo or multiplayer Uno", Usage: "!uno €amount | !uno start €amount | !uno join | !uno go", Category: "Games"},
+		{Name: "uno", Description: "Solo or multiplayer Uno", Usage: "!uno [nomercy [7-0]] €amount | !uno start [nomercy [7-0]] €amount | !uno join | !uno go", Category: "Games"},
 		{Name: "uno_pot", Description: "Show the community pot balance", Usage: "!uno_pot", Category: "Games"},
 	}
 }
@@ -382,7 +424,9 @@ func (p *UnoPlugin) OnMessage(ctx MessageContext) error {
 		// Multiplayer subcommands
 		switch {
 		case strings.HasPrefix(lower, "start "):
-			return p.handleMultiStart(ctx, strings.TrimSpace(args[6:]))
+			rest := strings.TrimSpace(args[6:])
+			noMercy, sevenZero, amountStr := parseNoMercyFlags(rest)
+			return p.handleMultiStart(ctx, amountStr, noMercy, sevenZero)
 		case lower == "join":
 			return p.handleMultiJoin(ctx)
 		case lower == "go":
@@ -393,16 +437,17 @@ func (p *UnoPlugin) OnMessage(ctx MessageContext) error {
 			return p.handleMultiCancel(ctx)
 		}
 
-		// Solo challenge: !uno €amount
+		// Solo challenge: !uno [nomercy [7-0]] €amount
+		noMercy, sevenZero, amountStr := parseNoMercyFlags(args)
 		if isGamesRoom(ctx.RoomID) {
-			return p.handleChallenge(ctx, ctx.RoomID)
+			return p.handleChallenge(ctx, ctx.RoomID, noMercy, sevenZero, amountStr)
 		}
 		// Allow starting from DM — announce to games room
 		gr := gamesRoom()
 		if gr == "" {
 			return nil
 		}
-		return p.handleChallenge(ctx, id.RoomID(gr))
+		return p.handleChallenge(ctx, id.RoomID(gr), noMercy, sevenZero, amountStr)
 	}
 
 	// DM gameplay — check solo games first, then multiplayer
@@ -487,13 +532,12 @@ func (p *UnoPlugin) handlePotCheck(ctx MessageContext) error {
 // Challenge
 // ---------------------------------------------------------------------------
 
-func (p *UnoPlugin) handleChallenge(ctx MessageContext, announceRoom id.RoomID) error {
+func (p *UnoPlugin) handleChallenge(ctx MessageContext, announceRoom id.RoomID, noMercy, sevenZeroRule bool, rawAmount string) error {
 	reply := func(text string) error {
 		return p.SendReply(ctx.RoomID, ctx.EventID, text)
 	}
 
-	args := p.GetArgs(ctx.Body, "uno")
-	amountStr := strings.TrimPrefix(strings.TrimSpace(args), "€")
+	amountStr := strings.TrimPrefix(strings.TrimSpace(rawAmount), "€")
 	var amount float64
 	fmt.Sscanf(amountStr, "%f", &amount)
 
@@ -531,7 +575,7 @@ func (p *UnoPlugin) handleChallenge(ctx MessageContext, announceRoom id.RoomID)
 	}
 
 	// Initialize game
-	game := p.initGame(ctx.Sender, announceRoom, dmRoom, amount)
+	game := p.initGame(ctx.Sender, announceRoom, dmRoom, amount, noMercy, sevenZeroRule)
 
 	p.mu.Lock()
 	p.games[ctx.Sender] = game
@@ -541,9 +585,18 @@ func (p *UnoPlugin) handleChallenge(ctx MessageContext, announceRoom id.RoomID)
 	// Room announcement
 	playerName := p.unoDisplayName(ctx.Sender)
 	botName := unoBotName()
+	modeTag := ""
+	startComment := pickCommentary("start")
+	if noMercy {
+		modeTag = " 🔥 **NO MERCY**"
+		startComment = pickNoMercyCommentary("nomercy_start")
+		if sevenZeroRule {
+			modeTag += " (7-0)"
+		}
+	}
 	p.SendMessage(announceRoom, fmt.Sprintf(
-		"🃏 **%s** has challenged %s to Uno! Stakes: €%d\n\n%s\n\n[Check your DMs to play.]",
-		playerName, botName, int(amount), pickCommentary("start"),
+		"🃏 **%s** has challenged %s to Uno!%s Stakes: €%d\n\n%s\n\n[Check your DMs to play.]",
+		playerName, botName, modeTag, int(amount), startComment,
 	))
 
 	// Send initial hand to player (auto-draws if no playable cards)
@@ -555,8 +608,13 @@ func (p *UnoPlugin) handleChallenge(ctx MessageContext, announceRoom id.RoomID)
 	return nil
 }
 
-func (p *UnoPlugin) initGame(playerID id.UserID, roomID, dmRoom id.RoomID, wager float64) *unoGame {
-	deck := newUnoDeck()
+func (p *UnoPlugin) initGame(playerID id.UserID, roomID, dmRoom id.RoomID, wager float64, noMercy, sevenZeroRule bool) *unoGame {
+	var deck []unoCard
+	if noMercy {
+		deck = newNoMercyDeck()
+	} else {
+		deck = newUnoDeck()
+	}
 
 	// Deal 7 cards each — copy into own slices to avoid shared backing array
 	playerHand := make([]unoCard, 7)
@@ -566,11 +624,11 @@ func (p *UnoPlugin) initGame(playerID id.UserID, roomID, dmRoom id.RoomID, wager
 	remaining := make([]unoCard, len(deck)-14)
 	copy(remaining, deck[14:])
 
-	// Flip starting card — must not be Wild or Wild Draw Four
+	// Flip starting card — must be a number card (not action/wild)
 	var startCard unoCard
 	startIdx := -1
 	for i, c := range remaining {
-		if c.Value != unoWildCard && c.Value != unoWildDrawFour {
+		if !c.Value.isAction() && !c.isWild() {
 			startCard = c
 			startIdx = i
 			break
@@ -584,7 +642,11 @@ func (p *UnoPlugin) initGame(playerID id.UserID, roomID, dmRoom id.RoomID, wager
 		drawPile = append(drawPile, remaining[startIdx+1:]...)
 	} else {
 		// All remaining are wilds (essentially impossible) — reshuffle whole deck
+		if noMercy {
+			deck = newNoMercyDeck()
+		} else {
 			deck = newUnoDeck()
+		}
 		copy(playerHand, deck[:7])
 		copy(botHand, deck[7:14])
 		startCard = deck[14]
@@ -604,6 +666,8 @@ func (p *UnoPlugin) initGame(playerID id.UserID, roomID, dmRoom id.RoomID, wager
 		topColor:      startCard.Color,
 		phase:         unoPhasePlay,
 		startedAt:     time.Now(),
+		noMercy:       noMercy,
+		sevenZeroRule: sevenZeroRule,
 	}
 }
 
@@ -639,12 +703,33 @@ func (p *UnoPlugin) handleDMInput(ctx MessageContext, game *unoGame) error {
 			game.calledUno = true
 			return p.SendMessage(game.dmRoomID, "✅ UNO called!")
 		}
+		// No Mercy stacking: accept the stack
+		if game.noMercy && game.stackMinValue > 0 && (input == "accept" || input == "a") {
+			drawn := game.draw(game.stackTotal)
+			game.playerHand = append(game.playerHand, drawn...)
+			p.SendMessage(game.dmRoomID, fmt.Sprintf("💥 You accept the stack and draw %d cards.\n%s",
+				game.stackTotal, pickNoMercyCommentary("stack_absorbed")))
+			game.stackTotal = 0
+			game.stackMinValue = 0
+			if p.checkSoloMercyElimination(game) {
+				return nil
+			}
+			return p.botTurn(game)
+		}
 		if input == "draw" {
+			// No Mercy: during stacking, draw is not allowed — must stack or accept
+			if game.noMercy && game.stackMinValue > 0 {
+				return p.SendMessage(game.dmRoomID, "You must play a draw card to stack, or type **accept** to draw the stack.")
+			}
 			return p.handlePlayerDraw(game)
 		}
 		// Parse card number
 		var cardIdx int
 		if _, err := fmt.Sscanf(input, "%d", &cardIdx); err != nil || cardIdx < 1 || cardIdx > len(game.playerHand) {
+			if game.noMercy && game.stackMinValue > 0 {
+				return p.SendMessage(game.dmRoomID,
+					fmt.Sprintf("Reply with a card number (1-%d) to stack, or **accept** to draw %d cards.", len(game.playerHand), game.stackTotal))
+			}
 			return p.SendMessage(game.dmRoomID,
 				fmt.Sprintf("Reply with a number (1-%d) to play a card, or **draw** to draw.", len(game.playerHand)))
 		}
@@ -657,7 +742,14 @@ func (p *UnoPlugin) handleDMInput(ctx MessageContext, game *unoGame) error {
 func (p *UnoPlugin) handlePlayerPlay(game *unoGame, idx int) error {
 	card := game.playerHand[idx]
 
-	if !card.canPlayOn(game.discardTop, game.topColor) {
+	// No Mercy stacking validation
+	if game.noMercy && game.stackMinValue > 0 {
+		if !card.canPlayOnStacking(game.topColor, game.stackMinValue) {
+			return p.SendMessage(game.dmRoomID,
+				fmt.Sprintf("You can't stack %s — need a draw card worth +%d or more. Type **accept** to draw %d.",
+					card.Display(), game.stackMinValue, game.stackTotal))
+		}
+	} else if !card.canPlayOn(game.discardTop, game.topColor) {
 		return p.SendMessage(game.dmRoomID, fmt.Sprintf("You can't play %s on %s. Choose another card or **draw**.",
 			card.Display(), game.discardTop.DisplayWithColor(game.topColor)))
 	}
@@ -678,7 +770,7 @@ func (p *UnoPlugin) handlePlayerPlay(game *unoGame, idx int) error {
 	game.discardTop = card
 	game.turns++
 
-	if card.Value == unoWildCard || card.Value == unoWildDrawFour {
+	if card.isWild() {
 		game.pendingCard = &card
 		game.phase = unoPhaseChooseColor
 		return p.SendMessage(game.dmRoomID,
@@ -709,7 +801,35 @@ func (p *UnoPlugin) handlePlayerPlay(game *unoGame, idx int) error {
 
 	p.SendMessage(game.dmRoomID, fmt.Sprintf("You played %s.%s", card.Display(), bookMsg))
 
+	// No Mercy: Discard All — remove remaining cards of same color
+	if game.noMercy && card.Value == unoDiscardAll {
+		discarded := discardAllOfColor(&game.playerHand, card.Color)
+		if discarded > 0 {
+			p.SendMessage(game.dmRoomID, fmt.Sprintf("Discarded %d additional %s cards!", discarded, card.Color))
+		}
+		if len(game.playerHand) == 0 {
+			return p.playerWins(game)
+		}
+	}
+
+	// No Mercy: 7-0 rule
+	if game.noMercy && game.sevenZeroRule {
+		if card.Value == unoSeven || card.Value == unoZero {
+			swapHandsSolo(game)
+			p.SendMessage(game.dmRoomID, fmt.Sprintf("Hands swapped! You now have %d cards, %s has %d.",
+				len(game.playerHand), unoBotName(), len(game.botHand)))
+			if p.checkSoloMercyElimination(game) {
+				return nil
+			}
+		}
+	}
+
 	// Apply action card effects
+	if game.noMercy && isDrawCard(card.Value) {
+		// No Mercy stacking: bot gets a chance to stack
+		return p.soloPlayerPlaysDrawCard(game, card)
+	}
+
 	if card.Value == unoDrawTwo {
 		drawn := game.draw(2)
 		game.botHand = append(game.botHand, drawn...)
@@ -722,6 +842,12 @@ func (p *UnoPlugin) handlePlayerPlay(game *unoGame, idx int) error {
 		return p.afterBotTurn(game)
 	}
 
+	// No Mercy: Skip Everyone (same as skip in 2-player)
+	if game.noMercy && card.Value == unoSkipEveryone {
+		p.SendMessage(game.dmRoomID, unoBotName()+"'s turn is skipped!")
+		return p.afterBotTurn(game)
+	}
+
 	// Bot's turn
 	return p.botTurn(game)
 }
@@ -765,7 +891,30 @@ func (p *UnoPlugin) handleColorChoice(game *unoGame, input string) error {
 
 	p.SendMessage(game.dmRoomID, fmt.Sprintf("Color set to %s %s.%s", color.Emoji(), color, bookMsg))
 
-	// Wild Draw Four — bot draws 4 and loses turn
+	// No Mercy wild effects
+	if game.noMercy && pendingCard != nil {
+		switch pendingCard.Value {
+		case unoWildReverseDraw4:
+			// Reverse (acts as skip in 2-player) + stacking with +4
+			return p.soloPlayerPlaysDrawCard(game, *pendingCard)
+		case unoWildDrawSix:
+			return p.soloPlayerPlaysDrawCard(game, *pendingCard)
+		case unoWildDrawTen:
+			return p.soloPlayerPlaysDrawCard(game, *pendingCard)
+		case unoWildColorRoulette:
+			// Next player (bot) flips until chosen color
+			bn := unoBotName()
+			flipped := p.executeColorRouletteSolo(game, false, color)
+			p.SendMessage(game.dmRoomID, fmt.Sprintf("🎰 Color Roulette! %s flips %d cards until finding %s %s.\n%s",
+				bn, len(flipped), color.Emoji(), color, pickNoMercyCommentary("color_roulette")))
+			if p.checkSoloMercyElimination(game) {
+				return nil
+			}
+			return p.afterBotTurn(game)
+		}
+	}
+
+	// Wild Draw Four — bot draws 4 and loses turn (classic mode)
 	if pendingCard != nil && pendingCard.Value == unoWildDrawFour {
 		drawn := game.draw(4)
 		game.botHand = append(game.botHand, drawn...)
@@ -784,6 +933,11 @@ func (p *UnoPlugin) handleColorChoice(game *unoGame, input string) error {
 }
 
 func (p *UnoPlugin) handlePlayerDraw(game *unoGame) error {
+	// No Mercy: draw until playable
+	if game.noMercy {
+		return p.handlePlayerDrawNoMercy(game)
+	}
+
 	drawn := game.draw(1)
 	if len(drawn) == 0 {
 		p.SendMessage(game.dmRoomID, "No cards left to draw! Turn passes to "+unoBotName()+".")
@@ -804,6 +958,48 @@ func (p *UnoPlugin) handlePlayerDraw(game *unoGame) error {
 	return p.botTurn(game)
 }
 
+func (p *UnoPlugin) handlePlayerDrawNoMercy(game *unoGame) error {
+	var allDrawn []unoCard
+	var playableCard *unoCard
+
+	for {
+		drawn := game.draw(1)
+		if len(drawn) == 0 {
+			break
+		}
+		card := drawn[0]
+		game.playerHand = append(game.playerHand, card)
+		allDrawn = append(allDrawn, card)
+
+		if p.checkSoloMercyElimination(game) {
+			return nil
+		}
+
+		if card.canPlayOn(game.discardTop, game.topColor) {
+			playableCard = &card
+			break
+		}
+	}
+
+	if len(allDrawn) == 0 {
+		p.SendMessage(game.dmRoomID, "No cards left to draw! Turn passes to "+unoBotName()+".")
+		return p.botTurn(game)
+	}
+
+	if playableCard != nil {
+		game.drawnCard = playableCard
+		game.phase = unoPhaseDrawnPlayable
+		return p.SendMessage(game.dmRoomID,
+			fmt.Sprintf("Drew %d card(s): %s\nLast card is playable! Play it? (**yes** / **no**)",
+				len(allDrawn), formatDrawnCards(allDrawn)))
+	}
+
+	p.SendMessage(game.dmRoomID,
+		fmt.Sprintf("Drew %d card(s): %s\nNo playable card found. Turn passes to %s.",
+			len(allDrawn), formatDrawnCards(allDrawn), unoBotName()))
+	return p.botTurn(game)
+}
+
 func (p *UnoPlugin) handleDrawnPlayable(game *unoGame, input string) error {
 	if input != "yes" && input != "y" && input != "no" && input != "n" {
 		return p.SendMessage(game.dmRoomID, "Play the drawn card? (**yes** / **no**)")
@@ -828,7 +1024,7 @@ func (p *UnoPlugin) handleDrawnPlayable(game *unoGame, input string) error {
 	game.discardTop = drawnCard
 	game.turns++
 
-	if drawnCard.Value == unoWildCard || drawnCard.Value == unoWildDrawFour {
+	if drawnCard.isWild() {
 		game.pendingCard = &drawnCard
 		game.phase = unoPhaseChooseColor
 		return p.SendMessage(game.dmRoomID,
@@ -851,13 +1047,41 @@ func (p *UnoPlugin) handleDrawnPlayable(game *unoGame, input string) error {
 	}
 	p.SendMessage(game.dmRoomID, fmt.Sprintf("You played %s.%s", drawnCard.Display(), bookMsg))
 
+	// No Mercy: Discard All
+	if game.noMercy && drawnCard.Value == unoDiscardAll {
+		discarded := discardAllOfColor(&game.playerHand, drawnCard.Color)
+		if discarded > 0 {
+			p.SendMessage(game.dmRoomID, fmt.Sprintf("Discarded %d additional %s cards!", discarded, drawnCard.Color))
+		}
+		if len(game.playerHand) == 0 {
+			return p.playerWins(game)
+		}
+	}
+
+	// No Mercy: 7-0 rule
+	if game.noMercy && game.sevenZeroRule {
+		if drawnCard.Value == unoSeven || drawnCard.Value == unoZero {
+			swapHandsSolo(game)
+			p.SendMessage(game.dmRoomID, fmt.Sprintf("Hands swapped! You now have %d cards, %s has %d.",
+				len(game.playerHand), unoBotName(), len(game.botHand)))
+			if p.checkSoloMercyElimination(game) {
+				return nil
+			}
+		}
+	}
+
+	// No Mercy stacking for draw cards
+	if game.noMercy && isDrawCard(drawnCard.Value) {
+		return p.soloPlayerPlaysDrawCard(game, drawnCard)
+	}
+
 	if drawnCard.Value == unoDrawTwo {
 		drawn := game.draw(2)
 		game.botHand = append(game.botHand, drawn...)
 		p.SendMessage(game.dmRoomID, unoBotName()+" draws 2 cards and loses their turn.")
 		return p.afterBotTurn(game)
 	}
-	if drawnCard.Value == unoSkip || drawnCard.Value == unoReverse {
+	if drawnCard.Value == unoSkip || drawnCard.Value == unoReverse || drawnCard.Value == unoSkipEveryone {
 		p.SendMessage(game.dmRoomID, unoBotName()+"'s turn is skipped!")
 		return p.afterBotTurn(game)
 	}
@@ -865,11 +1089,78 @@ func (p *UnoPlugin) handleDrawnPlayable(game *unoGame, input string) error {
 	return p.botTurn(game)
 }
 
+// ---------------------------------------------------------------------------
+// Solo stacking (No Mercy)
+// ---------------------------------------------------------------------------
+
+// soloPlayerPlaysDrawCard handles when the player plays a draw card in No Mercy.
+// The bot gets a chance to stack back.
+func (p *UnoPlugin) soloPlayerPlaysDrawCard(game *unoGame, card unoCard) error {
+	dv := cardDrawValue(card.Value)
+	game.stackTotal += dv
+	game.stackMinValue = dv
+
+	// Reverse effect for Wild Reverse Draw Four
+	if card.Value == unoWildReverseDraw4 {
+		// In 2-player, reverse = skip, so effectively bot is the target
+		// Direction doesn't matter in solo but we note the reverse
+	}
+
+	// Bot tries to stack
+	return p.soloBotHandleStack(game)
+}
+
+// soloBotHandleStack has the bot try to stack or absorb.
+func (p *UnoPlugin) soloBotHandleStack(game *unoGame) error {
+	bn := unoBotName()
+
+	// Bot tries to find a stackable card
+	stackCard, idx := botPickStackCard(game.botHand, game.topColor, game.stackMinValue)
+	if idx < 0 {
+		// Bot absorbs
+		drawn := game.draw(game.stackTotal)
+		game.botHand = append(game.botHand, drawn...)
+		p.SendMessage(game.dmRoomID, fmt.Sprintf("💥 %s can't stack! Draws %d cards. (%d cards now)\n%s",
+			bn, game.stackTotal, len(game.botHand), pickNoMercyCommentary("stack_absorbed")))
+		game.stackTotal = 0
+		game.stackMinValue = 0
+		if p.checkSoloMercyElimination(game) {
+			return nil
+		}
+		return p.afterBotTurn(game)
+	}
+
+	// Bot stacks
+	game.botHand = append(game.botHand[:idx], game.botHand[idx+1:]...)
+	game.discardTop = stackCard
+	dv := cardDrawValue(stackCard.Value)
+	game.stackTotal += dv
+	game.stackMinValue = dv
+	game.turns++
+
+	if stackCard.isWild() {
+		game.topColor = botPickColor(game.botHand)
+	} else {
+		game.topColor = stackCard.Color
+	}
+
+	p.SendMessage(game.dmRoomID, fmt.Sprintf("🔥 %s stacks: %s! Total penalty: +%d",
+		bn, stackCard.DisplayWithColor(game.topColor), game.stackTotal))
+
+	// Player must now respond to the stack
+	return p.playerTurnOrAutoDraw(game)
+}
+
 // ---------------------------------------------------------------------------
 // Bot turn
 // ---------------------------------------------------------------------------
 
 func (p *UnoPlugin) botTurn(game *unoGame) error {
+	// No Mercy stacking: if a stack is pending, bot must handle it
+	if game.noMercy && game.stackMinValue > 0 {
+		return p.soloBotHandleStack(game)
+	}
+
 	// Long game commentary (DM only)
 	if game.turns > 0 && game.turns%30 == 0 {
 		p.SendMessage(game.dmRoomID, pickCommentary("long_game"))
@@ -878,9 +1169,12 @@ func (p *UnoPlugin) botTurn(game *unoGame) error {
 	card, idx := p.botChooseCard(game)
 	if idx < 0 {
 		// Bot draws
+		if game.noMercy {
+			return p.botDrawNoMercy(game)
+		}
+
 		drawn := game.draw(1)
 		if len(drawn) == 0 {
-			// Can't draw — turn passes to player (show hand, don't auto-draw to avoid infinite loop)
 			p.SendMessage(game.dmRoomID, unoBotName()+" can't draw — no cards left. Turn passes.")
 			game.phase = unoPhasePlay
 			p.sendHandDisplay(game)
@@ -888,9 +1182,8 @@ func (p *UnoPlugin) botTurn(game *unoGame) error {
 		}
 		game.botHand = append(game.botHand, drawn[0])
 
-		// Check if drawn card is playable
 		if drawn[0].canPlayOn(game.discardTop, game.topColor) {
-			game.botHand = game.botHand[:len(game.botHand)-1] // remove last (drawn card)
+			game.botHand = game.botHand[:len(game.botHand)-1]
 			return p.botPlaysCard(game, drawn[0])
 		}
 
@@ -907,12 +1200,68 @@ func (p *UnoPlugin) botTurn(game *unoGame) error {
 	return p.botPlaysCard(game, card)
 }
 
+// botDrawNoMercy draws until playable for the bot in No Mercy mode.
+func (p *UnoPlugin) botDrawNoMercy(game *unoGame) error {
+	bn := unoBotName()
+	var allDrawn []unoCard
+	var playableCard *unoCard
+
+	for {
+		drawn := game.draw(1)
+		if len(drawn) == 0 {
+			break
+		}
+		card := drawn[0]
+		game.botHand = append(game.botHand, card)
+		allDrawn = append(allDrawn, card)
+		if p.checkSoloMercyElimination(game) {
+			return nil
+		}
+		if card.canPlayOn(game.discardTop, game.topColor) {
+			playableCard = &card
+			break
+		}
+	}
+
+	if len(allDrawn) == 0 {
+		p.SendMessage(game.dmRoomID, bn+" can't draw — no cards left. Turn passes.")
+		game.phase = unoPhasePlay
+		p.sendHandDisplay(game)
+		return nil
+	}
+
+	if playableCard != nil {
+		// Remove the playable card from bot's hand
+		for i := len(game.botHand) - 1; i >= 0; i-- {
+			if game.botHand[i] == *playableCard {
+				game.botHand = append(game.botHand[:i], game.botHand[i+1:]...)
+				break
+			}
+		}
+		commentKey := "bot_draw_normal"
+		if game.bookDown {
+			commentKey = "bot_draw_bookdown"
+		}
+		p.SendMessage(game.dmRoomID, fmt.Sprintf("%s drew %d card(s). %s",
+			bn, len(allDrawn), pickCommentary(commentKey)))
+		return p.botPlaysCard(game, *playableCard)
+	}
+
+	commentKey := "bot_draw_normal"
+	if game.bookDown {
+		commentKey = "bot_draw_bookdown"
+	}
+	p.SendMessage(game.dmRoomID, fmt.Sprintf("%s drew %d card(s). No playable card. %s",
+		bn, len(allDrawn), pickCommentary(commentKey)))
+	return p.playerTurnOrAutoDraw(game)
+}
+
 func (p *UnoPlugin) botPlaysCard(game *unoGame, card unoCard) error {
 	game.discardTop = card
 	game.turns++
 
 	// Choose color for wilds
-	if card.Value == unoWildCard || card.Value == unoWildDrawFour {
+	if card.isWild() {
 		game.topColor = p.botChooseColor(game)
 	} else {
 		game.topColor = card.Color
@@ -926,6 +1275,15 @@ func (p *UnoPlugin) botPlaysCard(game *unoGame, card unoCard) error {
 
 	switch card.Value {
 	case unoDrawTwo:
+		if game.noMercy {
+			// No Mercy: stacking
+			dm.WriteString(fmt.Sprintf("%s plays: %s — stack incoming! (+%d total)",
+				bn, displayCard, cardDrawValue(card.Value)))
+			p.SendMessage(game.dmRoomID, dm.String())
+			game.stackTotal = cardDrawValue(card.Value)
+			game.stackMinValue = cardDrawValue(card.Value)
+			return p.playerTurnOrAutoDraw(game)
+		}
 		commentKey := "bot_draw_two"
 		if game.bookDown {
 			commentKey = "bot_draw_two_bookdown"
@@ -935,6 +1293,15 @@ func (p *UnoPlugin) botPlaysCard(game *unoGame, card unoCard) error {
 		drawn := game.draw(2)
 		game.playerHand = append(game.playerHand, drawn...)
 
+	case unoDrawFour:
+		// Only exists in No Mercy — colored draw four
+		dm.WriteString(fmt.Sprintf("%s plays: %s — stack incoming! (+%d total)",
+			bn, displayCard, cardDrawValue(card.Value)))
+		p.SendMessage(game.dmRoomID, dm.String())
+		game.stackTotal = cardDrawValue(card.Value)
+		game.stackMinValue = cardDrawValue(card.Value)
+		return p.playerTurnOrAutoDraw(game)
+
 	case unoWildDrawFour:
 		commentKey := "bot_wild_draw_four"
 		if game.bookDown {
@@ -945,6 +1312,42 @@ func (p *UnoPlugin) botPlaysCard(game *unoGame, card unoCard) error {
 		drawn := game.draw(4)
 		game.playerHand = append(game.playerHand, drawn...)
 
+	case unoWildReverseDraw4:
+		dm.WriteString(fmt.Sprintf("%s plays: %s (chose %s %s) — stack incoming! (+%d total)",
+			bn, card.Display(), game.topColor.Emoji(), game.topColor, cardDrawValue(card.Value)))
+		p.SendMessage(game.dmRoomID, dm.String())
+		game.stackTotal = cardDrawValue(card.Value)
+		game.stackMinValue = cardDrawValue(card.Value)
+		return p.playerTurnOrAutoDraw(game)
+
+	case unoWildDrawSix:
+		dm.WriteString(fmt.Sprintf("%s plays: %s (chose %s %s) — stack incoming! (+%d total)",
+			bn, card.Display(), game.topColor.Emoji(), game.topColor, cardDrawValue(card.Value)))
+		p.SendMessage(game.dmRoomID, dm.String())
+		game.stackTotal = cardDrawValue(card.Value)
+		game.stackMinValue = cardDrawValue(card.Value)
+		return p.playerTurnOrAutoDraw(game)
+
+	case unoWildDrawTen:
+		dm.WriteString(fmt.Sprintf("%s plays: %s (chose %s %s) — stack incoming! (+%d total)",
+			bn, card.Display(), game.topColor.Emoji(), game.topColor, cardDrawValue(card.Value)))
+		p.SendMessage(game.dmRoomID, dm.String())
+		game.stackTotal = cardDrawValue(card.Value)
+		game.stackMinValue = cardDrawValue(card.Value)
+		return p.playerTurnOrAutoDraw(game)
+
+	case unoWildColorRoulette:
+		flipped := p.executeColorRouletteSolo(game, true, game.topColor)
+		dm.WriteString(fmt.Sprintf("%s plays: %s (chose %s %s)\n🎰 Color Roulette! You flip %d cards.\n%s",
+			bn, card.Display(), game.topColor.Emoji(), game.topColor,
+			len(flipped), pickNoMercyCommentary("color_roulette")))
+		p.SendMessage(game.dmRoomID, dm.String())
+		if p.checkSoloMercyElimination(game) {
+			return nil
+		}
+		// Player was the victim — bot goes again (skip effect)
+		return p.botTurn(game)
+
 	case unoSkip, unoReverse:
 		commentKey := "bot_play_normal"
 		if game.bookDown {
@@ -953,6 +1356,25 @@ func (p *UnoPlugin) botPlaysCard(game *unoGame, card unoCard) error {
 		dm.WriteString(fmt.Sprintf(pickCommentary(commentKey), displayCard))
 		dm.WriteString("\nYour turn is skipped!")
 
+	case unoSkipEveryone:
+		commentKey := "bot_play_normal"
+		if game.bookDown {
+			commentKey = "bot_play_bookdown"
+		}
+		dm.WriteString(fmt.Sprintf(pickCommentary(commentKey), displayCard))
+		dm.WriteString("\nYour turn is skipped!")
+
+	case unoDiscardAll:
+		discarded := discardAllOfColor(&game.botHand, card.Color)
+		commentKey := "bot_play_normal"
+		if game.bookDown {
+			commentKey = "bot_play_bookdown"
+		}
+		dm.WriteString(fmt.Sprintf(pickCommentary(commentKey), displayCard))
+		if discarded > 0 {
+			dm.WriteString(fmt.Sprintf("\n%s discards %d additional %s cards!", bn, discarded, card.Color))
+		}
+
 	default:
 		commentKey := "bot_play_normal"
 		if game.bookDown {
@@ -961,7 +1383,20 @@ func (p *UnoPlugin) botPlaysCard(game *unoGame, card unoCard) error {
 		dm.WriteString(fmt.Sprintf(pickCommentary(commentKey), displayCard))
 	}
 
-	// Check bot win
+	// No Mercy: 7-0 rule effects from bot
+	if game.noMercy && game.sevenZeroRule {
+		if card.Value == unoSeven || card.Value == unoZero {
+			swapHandsSolo(game)
+			dm.WriteString(fmt.Sprintf("\n%s\nHands swapped! You now have %d cards.",
+				pickNoMercyCommentary("hand_swap"), len(game.playerHand)))
+			if p.checkSoloMercyElimination(game) {
+				p.SendMessage(game.dmRoomID, dm.String())
+				return nil
+			}
+		}
+	}
+
+	// Check bot win (after discard all, etc.)
 	if len(game.botHand) == 0 {
 		p.SendMessage(game.dmRoomID, dm.String())
 		return p.botWins(game)
@@ -982,12 +1417,21 @@ func (p *UnoPlugin) botPlaysCard(game *unoGame, card unoCard) error {
 	}
 
 	// Skip/Reverse — bot goes again in 2-player
-	if card.Value == unoSkip || card.Value == unoReverse {
+	if card.Value == unoSkip || card.Value == unoReverse ||
+		card.Value == unoSkipEveryone {
 		p.SendMessage(game.dmRoomID, dm.String())
 		return p.botTurn(game)
 	}
 
 	p.SendMessage(game.dmRoomID, dm.String())
+
+	// Mercy check after player received cards (color roulette victim, etc.)
+	if game.noMercy {
+		if p.checkSoloMercyElimination(game) {
+			return nil
+		}
+	}
+
 	return p.playerTurnOrAutoDraw(game)
 }
 
@@ -1120,6 +1564,9 @@ func botPickColor(hand []unoCard) unoColor {
 
 // Solo wrappers for backward compatibility
 func (p *UnoPlugin) botChooseCard(game *unoGame) (unoCard, int) {
+	if game.noMercy {
+		return botPickCardNoMercy(game.botHand, game.discardTop, game.topColor, game.bookDown, len(game.playerHand), game.stackMinValue)
+	}
 	return botPickCard(game.botHand, game.discardTop, game.topColor, game.bookDown, len(game.playerHand))
 }
 
@@ -1150,6 +1597,9 @@ func (p *UnoPlugin) appendHandDisplay(game *unoGame, sb *strings.Builder) {
 	}
 
 	sb.WriteString(fmt.Sprintf("\n%s has %d cards.", unoBotName(), len(game.botHand)))
+	if game.noMercy && len(game.playerHand) >= 20 {
+		sb.WriteString(fmt.Sprintf("\n⚠️ **You have %d cards! (25 = eliminated)**", len(game.playerHand)))
+	}
 	sb.WriteString("\n\nReply with a card number to play, or **draw** to draw.")
 }
 
@@ -1159,19 +1609,98 @@ func (p *UnoPlugin) sendHandDisplay(game *unoGame) {
 	p.SendMessage(game.dmRoomID, sb.String())
 }
 
+// sendHandDisplayStacking shows hand during stacking — only stackable cards are playable.
+func (p *UnoPlugin) sendHandDisplayStacking(game *unoGame) {
+	var sb strings.Builder
+	sb.WriteString(fmt.Sprintf("⚠️ **Stack incoming: +%d!**\nDiscard pile: %s\n\n**Your hand:**\n",
+		game.stackTotal, game.discardTop.DisplayWithColor(game.topColor)))
+
+	for i, c := range game.playerHand {
+		marker := ""
+		if c.canPlayOnStacking(game.topColor, game.stackMinValue) {
+			marker = " ✅"
+		}
+		sb.WriteString(fmt.Sprintf("%d. %s%s\n", i+1, c.Display(), marker))
+	}
+
+	sb.WriteString(fmt.Sprintf("\n%s has %d cards.", unoBotName(), len(game.botHand)))
+	sb.WriteString("\n\nPlay a draw card to stack, or type **accept** to draw the stack.")
+
+	p.SendMessage(game.dmRoomID, sb.String())
+}
+
 // playerTurnOrAutoDraw shows the hand if the player has playable cards,
 // otherwise auto-draws and passes to the bot.
 func (p *UnoPlugin) playerTurnOrAutoDraw(game *unoGame) error {
+	// No Mercy stacking: if a stack is pending, show stack prompt
+	if game.noMercy && game.stackMinValue > 0 {
+		if hasStackableCard(game.playerHand, game.topColor, game.stackMinValue) {
+			game.phase = unoPhasePlay
+			p.sendHandDisplayStacking(game)
+			return nil
+		}
+		// Player must absorb the stack
+		drawn := game.draw(game.stackTotal)
+		game.playerHand = append(game.playerHand, drawn...)
+		p.SendMessage(game.dmRoomID, fmt.Sprintf("💥 No stackable card! You draw %d cards.\n%s",
+			game.stackTotal, pickNoMercyCommentary("stack_absorbed")))
+		game.stackTotal = 0
+		game.stackMinValue = 0
+		if p.checkSoloMercyElimination(game) {
+			return nil
+		}
+		// After absorbing, bot's turn (player was skipped)
+		return p.botTurn(game)
+	}
+
 	if game.hasPlayable() {
 		game.phase = unoPhasePlay
 		p.sendHandDisplay(game)
 		return nil
 	}
 
-	// No playable cards — try to draw
+	// No Mercy: draw until playable
+	if game.noMercy {
+		var allDrawn []unoCard
+		var playableCard *unoCard
+		for {
+			cards := game.draw(1)
+			if len(cards) == 0 {
+				break
+			}
+			card := cards[0]
+			game.playerHand = append(game.playerHand, card)
+			allDrawn = append(allDrawn, card)
+			if p.checkSoloMercyElimination(game) {
+				return nil
+			}
+			if card.canPlayOn(game.discardTop, game.topColor) {
+				playableCard = &card
+				break
+			}
+		}
+		if len(allDrawn) == 0 {
+			p.SendMessage(game.dmRoomID, "No playable cards and deck is empty.")
+			game.phase = unoPhasePlay
+			p.sendHandDisplay(game)
+			return nil
+		}
+		if playableCard != nil {
+			game.drawnCard = playableCard
+			game.phase = unoPhaseDrawnPlayable
+			return p.SendMessage(game.dmRoomID,
+				fmt.Sprintf("No playable cards — drew %d card(s): %s\nLast card is playable! Play it? (**yes** / **no**)",
+					len(allDrawn), formatDrawnCards(allDrawn)))
+		}
+		p.SendMessage(game.dmRoomID,
+			fmt.Sprintf("No playable cards — drew %d card(s). None playable. Turn passes to %s.",
+				len(allDrawn), unoBotName()))
+		return p.botTurn(game)
+	}
+
+	// Classic: draw one
 	drawn := game.draw(1)
 	if len(drawn) == 0 {
-		// Deck empty + no playable cards — show hand, let player try manually
 		p.SendMessage(game.dmRoomID, "No playable cards and deck is empty.")
 		game.phase = unoPhasePlay
 		p.sendHandDisplay(game)

internal/plugin/uno_nomercy.go

@@ -0,0 +1,614 @@
+package plugin
+
+import (
+	"fmt"
+	"math/rand/v2"
+	"strings"
+)
+
+// ---------------------------------------------------------------------------
+// No Mercy helpers
+// ---------------------------------------------------------------------------
+
+// cardDrawValue returns the draw penalty for a card (0 if not a draw card).
+func cardDrawValue(v unoValue) int {
+	switch v {
+	case unoDrawTwo:
+		return 2
+	case unoDrawFour, unoWildReverseDraw4:
+		return 4
+	case unoWildDrawSix:
+		return 6
+	case unoWildDrawTen:
+		return 10
+	default:
+		return 0
+	}
+}
+
+func isDrawCard(v unoValue) bool {
+	return cardDrawValue(v) > 0
+}
+
+// canPlayOnStacking checks if a card can be played during a stacking phase.
+// Only draw cards with value >= stackMinValue are allowed.
+// Wild draws always match; colored draws must match topColor.
+func (c unoCard) canPlayOnStacking(topColor unoColor, stackMinValue int) bool {
+	dv := cardDrawValue(c.Value)
+	if dv < stackMinValue {
+		return false
+	}
+	if c.isWild() {
+		return true
+	}
+	return c.Color == topColor
+}
+
+// hasStackableCard returns true if the hand contains a card that can be stacked.
+func hasStackableCard(hand []unoCard, topColor unoColor, stackMinValue int) bool {
+	for _, c := range hand {
+		if c.canPlayOnStacking(topColor, stackMinValue) {
+			return true
+		}
+	}
+	return false
+}
+
+// ---------------------------------------------------------------------------
+// No Mercy deck (168 cards)
+// ---------------------------------------------------------------------------
+
+func newNoMercyDeck() []unoCard {
+	var cards []unoCard
+	colors := []unoColor{unoRed, unoBlue, unoYellow, unoGreen}
+
+	for _, color := range colors {
+		// Numbers 0-9: ×2 each
+		for v := unoZero; v <= unoNine; v++ {
+			cards = append(cards, unoCard{color, v})
+			cards = append(cards, unoCard{color, v})
+		}
+		// Skip ×3
+		for i := 0; i < 3; i++ {
+			cards = append(cards, unoCard{color, unoSkip})
+		}
+		// Skip Everyone ×2
+		for i := 0; i < 2; i++ {
+			cards = append(cards, unoCard{color, unoSkipEveryone})
+		}
+		// Reverse ×4
+		for i := 0; i < 4; i++ {
+			cards = append(cards, unoCard{color, unoReverse})
+		}
+		// Draw Two ×2
+		for i := 0; i < 2; i++ {
+			cards = append(cards, unoCard{color, unoDrawTwo})
+		}
+		// Draw Four (colored) ×2
+		for i := 0; i < 2; i++ {
+			cards = append(cards, unoCard{color, unoDrawFour})
+		}
+		// Discard All ×3
+		for i := 0; i < 3; i++ {
+			cards = append(cards, unoCard{color, unoDiscardAll})
+		}
+	}
+
+	// Wild Reverse Draw Four ×8
+	for i := 0; i < 8; i++ {
+		cards = append(cards, unoCard{unoWild, unoWildReverseDraw4})
+	}
+	// Wild Draw Six ×4
+	for i := 0; i < 4; i++ {
+		cards = append(cards, unoCard{unoWild, unoWildDrawSix})
+	}
+	// Wild Draw Ten ×4
+	for i := 0; i < 4; i++ {
+		cards = append(cards, unoCard{unoWild, unoWildDrawTen})
+	}
+	// Wild Color Roulette ×8
+	for i := 0; i < 8; i++ {
+		cards = append(cards, unoCard{unoWild, unoWildColorRoulette})
+	}
+
+	rand.Shuffle(len(cards), func(i, j int) { cards[i], cards[j] = cards[j], cards[i] })
+	return cards
+}
+
+// ---------------------------------------------------------------------------
+// Mercy Rule
+// ---------------------------------------------------------------------------
+
+const mercyLimit = 25
+
+// checkSoloMercyElimination checks if the player or bot has 25+ cards.
+// Returns true if someone was eliminated (game ends).
+func (p *UnoPlugin) checkSoloMercyElimination(game *unoGame) bool {
+	if !game.noMercy {
+		return false
+	}
+	if len(game.playerHand) >= mercyLimit {
+		p.SendMessage(game.dmRoomID,
+			fmt.Sprintf("💀 **MERCY KILL!** You have %d cards — eliminated!", len(game.playerHand)))
+		p.botWins(game)
+		return true
+	}
+	if len(game.botHand) >= mercyLimit {
+		bn := unoBotName()
+		p.SendMessage(game.dmRoomID,
+			fmt.Sprintf("💀 **MERCY KILL!** %s has %d cards — eliminated!", bn, len(game.botHand)))
+		p.playerWins(game)
+		return true
+	}
+	return false
+}
+
+// checkMultiMercyElimination checks if a multiplayer player has 25+ cards.
+// Returns true if the player was eliminated.
+func (p *UnoPlugin) checkMultiMercyElimination(game *unoMultiGame, player *unoMultiPlayer) bool {
+	if !game.noMercy || len(player.hand) < mercyLimit {
+		return false
+	}
+
+	player.active = false
+	name := p.unoDisplayName(player.userID)
+	if player.isBot {
+		name = unoBotName()
+	}
+
+	// Shuffle cards back into draw pile
+	game.drawPile = append(game.drawPile, player.hand...)
+	rand.Shuffle(len(game.drawPile), func(i, j int) { game.drawPile[i], game.drawPile[j] = game.drawPile[j], game.drawPile[i] })
+	player.hand = nil
+
+	p.SendMessage(game.roomID,
+		fmt.Sprintf("💀 **MERCY KILL!** %s had %d+ cards — eliminated!\n\n%s",
+			name, mercyLimit, pickNoMercyCommentary("mercy_kill")))
+
+	if !player.isBot {
+		p.SendMessage(player.dmRoomID,
+			fmt.Sprintf("💀 You've been mercy-killed! (%d+ cards)", mercyLimit))
+	}
+
+	// Check if game should end
+	active := game.activePlayers()
+	if len(active) <= 1 {
+		if len(active) == 1 {
+			winner := active[0]
+			if winner.isBot {
+				p.multiBotWins(game)
+			} else {
+				p.multiPlayerWins(game, winner)
+			}
+		} else {
+			game.done = true
+			p.SendMessage(game.roomID, "🃏 Game ended — no players remaining.")
+			p.cleanupMultiGame(game)
+		}
+		return true
+	}
+
+	return true
+}
+
+// ---------------------------------------------------------------------------
+// Draw-until-playable helpers
+// ---------------------------------------------------------------------------
+
+// formatDrawnCards formats a list of drawn cards for display.
+func formatDrawnCards(cards []unoCard) string {
+	if len(cards) == 1 {
+		return cards[0].Display()
+	}
+	var parts []string
+	for _, c := range cards {
+		parts = append(parts, c.Display())
+	}
+	return strings.Join(parts, ", ")
+}
+
+// ---------------------------------------------------------------------------
+// Color Roulette
+// ---------------------------------------------------------------------------
+
+// executeColorRoulette flips cards from draw pile until the chosen color appears.
+// All flipped cards are added to the target's hand.
+// Returns the flipped cards for display.
+func (p *UnoPlugin) executeColorRouletteSolo(game *unoGame, targetIsPlayer bool, chosenColor unoColor) []unoCard {
+	var flipped []unoCard
+	for {
+		if len(game.drawPile) == 0 {
+			game.reshuffleDiscard()
+		}
+		if len(game.drawPile) == 0 {
+			break
+		}
+		card := game.drawPile[0]
+		game.drawPile = game.drawPile[1:]
+		flipped = append(flipped, card)
+		if targetIsPlayer {
+			game.playerHand = append(game.playerHand, card)
+		} else {
+			game.botHand = append(game.botHand, card)
+		}
+		if card.Color == chosenColor {
+			break
+		}
+	}
+	return flipped
+}
+
+func (p *UnoPlugin) executeColorRouletteMulti(game *unoMultiGame, target *unoMultiPlayer, chosenColor unoColor) []unoCard {
+	var flipped []unoCard
+	for {
+		if len(game.drawPile) == 0 {
+			game.reshuffleDiscard()
+		}
+		if len(game.drawPile) == 0 {
+			break
+		}
+		card := game.drawPile[0]
+		game.drawPile = game.drawPile[1:]
+		flipped = append(flipped, card)
+		target.hand = append(target.hand, card)
+		if card.Color == chosenColor {
+			break
+		}
+	}
+	return flipped
+}
+
+// ---------------------------------------------------------------------------
+// 7-0 Rule helpers
+// ---------------------------------------------------------------------------
+
+// rotateHandsMulti rotates all active players' hands in the play direction.
+func rotateHandsMulti(game *unoMultiGame) {
+	active := game.activePlayers()
+	if len(active) < 2 {
+		return
+	}
+
+	// Build ordered list of active players by turn order in current direction
+	n := len(game.players)
+	var ordered []*unoMultiPlayer
+	idx := game.currentIdx
+	for i := 0; i < n; i++ {
+		p := game.players[idx]
+		if p.active {
+			ordered = append(ordered, p)
+		}
+		idx = (idx + game.direction + n) % n
+	}
+
+	if len(ordered) < 2 {
+		return
+	}
+
+	// Save all hands
+	hands := make([][]unoCard, len(ordered))
+	for i, p := range ordered {
+		hands[i] = p.hand
+	}
+
+	// Rotate: each player gets the hand of the player behind them (opposite of direction)
+	for i := range ordered {
+		prev := (i - 1 + len(ordered)) % len(ordered)
+		ordered[i].hand = hands[prev]
+	}
+}
+
+// swapHandsSolo swaps player and bot hands.
+func swapHandsSolo(game *unoGame) {
+	game.playerHand, game.botHand = game.botHand, game.playerHand
+}
+
+// swapHandsMulti swaps two players' hands.
+func swapHandsMulti(a, b *unoMultiPlayer) {
+	a.hand, b.hand = b.hand, a.hand
+}
+
+// ---------------------------------------------------------------------------
+// Discard All helper
+// ---------------------------------------------------------------------------
+
+// discardAllOfColor removes all cards of the given color from the hand.
+// Returns the count of additional cards removed (not counting the played card).
+func discardAllOfColor(hand *[]unoCard, color unoColor) int {
+	var kept []unoCard
+	removed := 0
+	for _, c := range *hand {
+		if c.Color == color {
+			removed++
+		} else {
+			kept = append(kept, c)
+		}
+	}
+	*hand = kept
+	return removed
+}
+
+// ---------------------------------------------------------------------------
+// No Mercy Bot AI
+// ---------------------------------------------------------------------------
+
+// botPickCardNoMercy selects the best card for bot in No Mercy mode.
+func botPickCardNoMercy(hand []unoCard, discardTop unoCard, topColor unoColor, bookDown bool, opponentMinCards int, stackMinValue int) (unoCard, int) {
+	// During stacking, only stackable cards are valid
+	if stackMinValue > 0 {
+		return botPickStackCard(hand, topColor, stackMinValue)
+	}
+
+	var playable []int
+	for i, c := range hand {
+		if c.canPlayOn(discardTop, topColor) {
+			playable = append(playable, i)
+		}
+	}
+	if len(playable) == 0 {
+		return unoCard{}, -1
+	}
+
+	if bookDown {
+		return botPickAggressiveNoMercy(hand, topColor, playable)
+	}
+	return botPickNormalNoMercy(hand, topColor, playable, opponentMinCards)
+}
+
+func botPickStackCard(hand []unoCard, topColor unoColor, stackMinValue int) (unoCard, int) {
+	var stackable []int
+	for i, c := range hand {
+		if c.canPlayOnStacking(topColor, stackMinValue) {
+			stackable = append(stackable, i)
+		}
+	}
+	if len(stackable) == 0 {
+		return unoCard{}, -1 // bot must absorb
+	}
+	// Play the lowest-value stackable card to preserve bigger weapons
+	bestIdx := stackable[0]
+	bestVal := cardDrawValue(hand[bestIdx].Value)
+	for _, i := range stackable[1:] {
+		dv := cardDrawValue(hand[i].Value)
+		if dv < bestVal {
+			bestIdx = i
+			bestVal = dv
+		}
+	}
+	return hand[bestIdx], bestIdx
+}
+
+func botPickNormalNoMercy(hand []unoCard, topColor unoColor, playable []int, opponentMinCards int) (unoCard, int) {
+	var draws, actions, numbers, discardAlls, skipEveryones, roulettes []int
+
+	for _, i := range playable {
+		c := hand[i]
+		switch {
+		case isDrawCard(c.Value):
+			draws = append(draws, i)
+		case c.Value == unoDiscardAll:
+			discardAlls = append(discardAlls, i)
+		case c.Value == unoSkipEveryone:
+			skipEveryones = append(skipEveryones, i)
+		case c.Value == unoWildColorRoulette:
+			roulettes = append(roulettes, i)
+		case c.Value.isAction():
+			actions = append(actions, i)
+		default:
+			numbers = append(numbers, i)
+		}
+	}
+
+	// Prioritize Discard All if we have 3+ cards of that color
+	for _, i := range discardAlls {
+		color := hand[i].Color
+		count := 0
+		for _, c := range hand {
+			if c.Color == color {
+				count++
+			}
+		}
+		if count >= 3 {
+			return hand[i], i
+		}
+	}
+
+	// If opponent close to winning, go aggressive with draw cards
+	if opponentMinCards <= 3 {
+		if len(draws) > 0 {
+			// Play highest draw value
+			bestIdx := draws[0]
+			bestVal := cardDrawValue(hand[bestIdx].Value)
+			for _, i := range draws[1:] {
+				dv := cardDrawValue(hand[i].Value)
+				if dv > bestVal {
+					bestIdx = i
+					bestVal = dv
+				}
+			}
+			return hand[bestIdx], bestIdx
+		}
+		if len(skipEveryones) > 0 {
+			return hand[skipEveryones[0]], skipEveryones[0]
+		}
+	}
+
+	// Normal priority: numbers > actions > discard all > skip everyone > draws > roulettes
+	if len(numbers) > 0 {
+		// Prefer color match
+		for _, i := range numbers {
+			if hand[i].Color == topColor {
+				return hand[i], i
+			}
+		}
+		return hand[numbers[0]], numbers[0]
+	}
+	if len(actions) > 0 {
+		return hand[actions[0]], actions[0]
+	}
+	if len(discardAlls) > 0 {
+		return hand[discardAlls[0]], discardAlls[0]
+	}
+	if len(skipEveryones) > 0 {
+		return hand[skipEveryones[0]], skipEveryones[0]
+	}
+	if len(draws) > 0 {
+		// Play lowest draw to save bigger ones
+		bestIdx := draws[0]
+		bestVal := cardDrawValue(hand[bestIdx].Value)
+		for _, i := range draws[1:] {
+			dv := cardDrawValue(hand[i].Value)
+			if dv < bestVal {
+				bestIdx = i
+				bestVal = dv
+			}
+		}
+		return hand[bestIdx], bestIdx
+	}
+	if len(roulettes) > 0 {
+		return hand[roulettes[0]], roulettes[0]
+	}
+	return hand[playable[0]], playable[0]
+}
+
+func botPickAggressiveNoMercy(hand []unoCard, topColor unoColor, playable []int) (unoCard, int) {
+	var draws, actions, others []int
+
+	for _, i := range playable {
+		c := hand[i]
+		switch {
+		case isDrawCard(c.Value):
+			draws = append(draws, i)
+		case c.Value.isAction():
+			actions = append(actions, i)
+		default:
+			others = append(others, i)
+		}
+	}
+
+	// Aggressive: play highest draw card first
+	if len(draws) > 0 {
+		bestIdx := draws[0]
+		bestVal := cardDrawValue(hand[bestIdx].Value)
+		for _, i := range draws[1:] {
+			dv := cardDrawValue(hand[i].Value)
+			if dv > bestVal {
+				bestIdx = i
+				bestVal = dv
+			}
+		}
+		return hand[bestIdx], bestIdx
+	}
+	if len(actions) > 0 {
+		return hand[actions[0]], actions[0]
+	}
+	if len(others) > 0 {
+		return hand[others[0]], others[0]
+	}
+	return hand[playable[0]], playable[0]
+}
+
+// botChooseSwapTarget picks the player with the fewest cards (to steal a small hand).
+func botChooseSwapTarget(game *unoMultiGame, bot *unoMultiPlayer) *unoMultiPlayer {
+	var best *unoMultiPlayer
+	bestCards := 999
+	for _, p := range game.players {
+		if p == bot || !p.active {
+			continue
+		}
+		if len(p.hand) < bestCards {
+			bestCards = len(p.hand)
+			best = p
+		}
+	}
+	return best
+}
+
+// botRouletteColor picks a color the bot has least of (to maximize damage).
+func botRouletteColor(hand []unoCard) unoColor {
+	counts := map[unoColor]int{}
+	for _, c := range hand {
+		if c.Color != unoWild {
+			counts[c.Color]++
+		}
+	}
+	// Pick color with fewest cards (opponent likely has fewer too)
+	best := unoRed
+	bestCount := 999
+	for _, color := range []unoColor{unoRed, unoBlue, unoYellow, unoGreen} {
+		if counts[color] < bestCount {
+			bestCount = counts[color]
+			best = color
+		}
+	}
+	return best
+}
+
+// ---------------------------------------------------------------------------
+// No Mercy commentary
+// ---------------------------------------------------------------------------
+
+var noMercyCommentary = map[string][]string{
+	"nomercy_start": {
+		"*GogoBee sets the book down. Not gently.*\n\n\"No mercy? Fine. 💛\"\n\n*deals cards with unsettling precision*",
+		"*GogoBee marks the page, closes the book with a snap.*\n\n\"Oh, you want to play *that* version. Okay. 💛\"\n\n*shuffles 168 cards without breaking eye contact*",
+	},
+	"mercy_kill": {
+		"\"Sometimes the kindest thing is the quickest. 💛\" *doesn't look up*",
+		"\"That's what mercy looks like. 💛\"",
+		"\"...and that's why they call it No Mercy. 💛\"",
+	},
+	"stack_absorbed": {
+		"\"That's a lot of cards. 💛\" *turns a page*",
+		"\"Ouch. 💛\"",
+	},
+	"color_roulette": {
+		"\"Let's see what fate has in store. 💛\"",
+		"\"Flip, flip, flip... 💛\" *watches with mild interest*",
+	},
+	"discard_all": {
+		"\"Oh, that's efficient. 💛\"",
+	},
+	"skip_everyone": {
+		"\"Nobody gets a turn. How fun. 💛\"",
+	},
+	"hand_swap": {
+		"\"Musical chairs, card edition. 💛\"",
+		"\"Surprise. 💛\"",
+	},
+	"hand_rotate": {
+		"\"Everyone pass your cards. Yes, all of them. 💛\"",
+	},
+}
+
+func pickNoMercyCommentary(key string) string {
+	lines := noMercyCommentary[key]
+	if len(lines) == 0 {
+		return ""
+	}
+	line := lines[rand.IntN(len(lines))]
+	return strings.ReplaceAll(line, "GogoBee", unoBotName())
+}
+
+// ---------------------------------------------------------------------------
+// No Mercy mode flags parser
+// ---------------------------------------------------------------------------
+
+// parseNoMercyFlags parses "nomercy [7-0] €amount" and returns noMercy, sevenZeroRule, and remaining amount string.
+func parseNoMercyFlags(args string) (noMercy bool, sevenZeroRule bool, amountStr string) {
+	lower := strings.ToLower(strings.TrimSpace(args))
+
+	if !strings.HasPrefix(lower, "nomercy") {
+		return false, false, args
+	}
+
+	rest := strings.TrimSpace(args[7:]) // len("nomercy") == 7
+	lowerRest := strings.ToLower(rest)
+
+	if strings.HasPrefix(lowerRest, "7-0") {
+		return true, true, strings.TrimSpace(rest[3:])
+	}
+
+	return true, false, rest
+}
+