solitaire: detect a won board and finish it in one press

A drained, all-face-up board is a guaranteed clear that auto() sweeps home
in a single cascade, but the only way to trigger it was double-clicking
thirty cards home by hand. Add State.Won(), surface it in the view, and
swap the ordinary controls for one pulsing finish button when it's true.

internal/games/klondike/klondike.go

@@ -620,6 +620,31 @@ func (s State) Net() int64 {
 // cleared reports whether every card is home.
 func (s State) cleared() bool { return s.Home() == FullDeck }
 
+// Won reports that the board is a guaranteed clear: nothing left in the stock or
+// waste, and not a single face-down card under any column. From here every card
+// is a face-up run and a single auto() drains the whole board to the foundations
+// without a choice left to make — which is exactly the tedious tail the felt
+// should offer to finish in one gesture instead of thirty double-clicks.
+//
+// It's deliberately narrower than "solvable": a draw-one board with cards still
+// in the stock is winnable too, but auto() won't turn the stock over, so calling
+// that won would light a finish button that then stalls. This is the state the
+// finish button actually finishes.
+func (s State) Won() bool {
+	if s.Phase == PhaseDone || s.cleared() {
+		return false
+	}
+	if len(s.Stock) > 0 || len(s.Waste) > 0 {
+		return false
+	}
+	for _, p := range s.Table {
+		if len(p.Down) > 0 {
+			return false
+		}
+	}
+	return true
+}
+
 // CanAuto reports whether anything can go home at all — which is what greys the
 // finish button out rather than letting it be pressed at a board that has nothing
 // for it.

internal/games/klondike/klondike_test.go

@@ -423,6 +423,52 @@ func TestAutoSendsEverythingItCanHome(t *testing.T) {
 	refuses(t, next, Move{Kind: "auto"}, ErrNothingHome)
 }
 
+// Won is the state the finish button finishes: every card face up, the stock and
+// waste drained, so a single auto sweeps the lot home. The button is only honest
+// if these two agree — Won lighting up on a board auto can't clear would stall.
+func TestWonIsExactlyWhatAutoCanFinish(t *testing.T) {
+	s := board(patient(), 5200)
+	// A won board: three short face-up runs across the columns, nothing face down,
+	// nothing in the stock or waste. Every card is reachable.
+	s.Table[0].Up = []cards.Card{card(2, cards.Spades), card(cards.Ace, cards.Hearts)}
+	s.Table[1].Up = []cards.Card{card(2, cards.Hearts), card(cards.Ace, cards.Spades)}
+	s.Table[2].Up = []cards.Card{card(2, cards.Diamonds), card(cards.Ace, cards.Clubs)}
+	s.Table[3].Up = []cards.Card{card(2, cards.Clubs), card(cards.Ace, cards.Diamonds)}
+
+	if !s.Won() {
+		t.Fatalf("a board with everything face up and the piles empty is won")
+	}
+
+	next, _ := apply(t, s, Move{Kind: "auto"})
+	if next.Home() != 8 { // the eight cards laid out above
+		t.Fatalf("auto homed %d cards, want 8 — the whole won board", next.Home())
+	}
+
+	// Anything still hidden or still in a pile is not won: auto would stall on it.
+	withStock := s.clone()
+	withStock.Stock = cards.Deck{card(5, cards.Spades)}
+	if withStock.Won() {
+		t.Errorf("a board with a card still in the stock is not won — auto won't turn it over")
+	}
+	withWaste := s.clone()
+	withWaste.Waste = []cards.Card{card(5, cards.Spades)}
+	if withWaste.Won() {
+		t.Errorf("a board with a card still in the waste is not won")
+	}
+	withDown := s.clone()
+	withDown.Table[5].Down = []cards.Card{card(5, cards.Spades)}
+	if withDown.Won() {
+		t.Errorf("a board with a face-down card is not won")
+	}
+
+	// A finished board is never won: the button belongs to a game still in play.
+	cleared := s.clone()
+	cleared.Phase = PhaseDone
+	if cleared.Won() {
+		t.Errorf("a settled board reports won")
+	}
+}
+
 // ---- the money -------------------------------------------------------------
 
 // The number the felt quotes while you play and the number settle() lands on are

internal/web/games_solitaire.go

@@ -60,6 +60,7 @@ type solitaireView struct {
 	Passes  int  `json:"passes"` // through the stock, counting this one; -1 unlimited
 	Moves   int  `json:"moves"`
 	CanAuto bool `json:"can_auto"`
+	Won     bool `json:"won"` // every card face up, stock and waste empty: one press finishes it
 
 	Home      int     `json:"home"`       // cards on the foundations
 	PerCard   float64 `json:"per_card"`   // what one more is worth
@@ -86,6 +87,7 @@ func viewSolitaire(g klondike.State) solitaireView {
 		Passes:    g.PassesLeft(),
 		Moves:     g.Moves,
 		CanAuto:   g.CanAuto(),
+		Won:       g.Won(),
 		Home:      g.Home(),
 		PerCard:   g.PerCard(),
 		BreakEven: g.Tier.BreakEven(),

internal/web/static/css/input.css

@@ -940,6 +940,18 @@ html[data-phase="night"] {
     will-change: transform, opacity;
   }
 
+  /* Falling money — the win curtain. Positioned entirely by the transform WAAPI
+     drives (see moneyRain in casino-fx.js), so it starts pinned to the top-left. */
+  .pete-money {
+    position: absolute;
+    top: 0;
+    left: 0;
+    font-size: 1.6rem;
+    line-height: 1;
+    filter: drop-shadow(0 2px 2px rgba(0,0,0,0.35));
+    will-change: transform, opacity;
+  }
+
   /* The dealer's beat before they draw out. */
   .pete-dealer-think {
     animation: pete-think 0.9s ease-in-out infinite;
@@ -1444,6 +1456,14 @@ html[data-phase="night"] {
     100% { box-shadow: 0 0 0 1.4rem rgba(242, 181, 61, 0); }
   }
 
+  /* The finish button on a won board breathes, so the one press left to make is
+     the one the eye lands on. */
+  .pete-finish { animation: pete-finish-pulse 1.6s ease-in-out infinite; }
+  @keyframes pete-finish-pulse {
+    0%, 100% { box-shadow: 0 0 0 0 rgba(242, 181, 61, 0.55); }
+    50%      { box-shadow: 0 0 0 0.9rem rgba(242, 181, 61, 0); }
+  }
+
   /* The rail: the house's rack, what you've banked, the meter. On a wide screen
      it's a column down the right of the felt; on a narrow one it lies down and
      sits under the board. */
@@ -1978,6 +1998,93 @@ html[data-phase="night"] {
   }
   .pete-uno-seat[data-out="1"] .pete-uno-count { color: #ffb3ba; }
 
+  /* The send-off. When the mercy rule buries a seat, uno.js rolls one of four
+     of these and drops it over that seat — or over your hand, if it's you going
+     down. Every piece is built fresh and clears itself, so it can't outlive the
+     hand. The wrap is a zero-size anchor at the seat's middle; the pieces hang
+     off it. */
+  .pete-uno-bury {
+    position: absolute;
+    left: 50%;
+    top: 45%;
+    width: 0;
+    height: 0;
+    z-index: 40;
+    pointer-events: none;
+  }
+
+  /* Rockslide: a handful of boulders come down and pile where the seat was. */
+  .pete-uno-rock {
+    position: absolute;
+    left: 0;
+    top: 0;
+    font-size: 1.5rem;
+    line-height: 1;
+    filter: drop-shadow(0 2px 1px rgba(0,0,0,0.4));
+    animation: pete-bury-rock 0.6s cubic-bezier(0.5, 0, 0.7, 1) both;
+    animation-delay: var(--d, 0ms);
+  }
+  @keyframes pete-bury-rock {
+    0%   { transform: translate(calc(-50% + var(--dx)), -3.4rem) rotate(0deg); opacity: 0; }
+    20%  { opacity: 1; }
+    75%  { transform: translate(calc(-50% + var(--dx)), var(--dy)) rotate(var(--rot)); }
+    85%  { transform: translate(calc(-50% + var(--dx)), calc(var(--dy) - 0.22rem)) rotate(var(--rot)); }
+    100% { transform: translate(calc(-50% + var(--dx)), var(--dy)) rotate(var(--rot)); opacity: 1; }
+  }
+
+  /* Tombstone and coffin: one heavy thing drops in and sets, with a small bounce. */
+  .pete-uno-tomb,
+  .pete-uno-coffin {
+    position: absolute;
+    left: 0;
+    top: 0;
+    line-height: 1;
+    filter: drop-shadow(0 3px 2px rgba(0,0,0,0.45));
+    animation: pete-bury-drop 0.5s cubic-bezier(0.34, 1.3, 0.64, 1) both;
+  }
+  .pete-uno-tomb { font-size: 2.4rem; }
+  .pete-uno-coffin { font-size: 2.5rem; }
+  @keyframes pete-bury-drop {
+    0%   { transform: translate(-50%, -3.2rem) scale(0.7); opacity: 0; }
+    55%  { opacity: 1; }
+    70%  { transform: translate(-50%, -50%) scale(1.06); }
+    82%  { transform: translate(-50%, -44%) scale(1); }
+    100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
+  }
+
+  /* The Mega Man death: a flash, then eight pieces fire out and wink off. */
+  .pete-uno-zap-flash {
+    position: absolute;
+    left: 0;
+    top: 0;
+    width: 1.5rem;
+    height: 1.5rem;
+    margin: -0.75rem 0 0 -0.75rem;
+    border-radius: 999px;
+    background: radial-gradient(circle, #fff 0%, rgba(180,220,255,0) 70%);
+    animation: pete-bury-flash 0.35s ease-out both;
+  }
+  @keyframes pete-bury-flash {
+    0%   { transform: scale(0.3); opacity: 0.95; }
+    100% { transform: scale(1.9); opacity: 0; }
+  }
+  .pete-uno-zap-bit {
+    position: absolute;
+    left: 0;
+    top: 0;
+    width: 0.5rem;
+    height: 0.5rem;
+    margin: -0.25rem 0 0 -0.25rem;
+    border-radius: 999px;
+    background: #cfeaff;
+    box-shadow: 0 0 6px 1px rgba(150,210,255,0.9);
+    animation: pete-bury-zap 0.5s ease-out both;
+  }
+  @keyframes pete-bury-zap {
+    0%   { transform: rotate(var(--ang)) translateX(0.2rem); opacity: 1; }
+    100% { transform: rotate(var(--ang)) translateX(3.4rem); opacity: 0; }
+  }
+
   /* The rules switch: two dials, and this is the one that isn't the table size. */
   .pete-seg {
     display: inline-flex;
@@ -2031,7 +2138,8 @@ html[data-phase="night"] {
     .pete-tile-hit,
     .pete-meter[data-hit="1"] { animation: none; }
     .pete-nope,
-    .pete-home-flash { animation: none; }
+    .pete-home-flash,
+    .pete-finish { animation: none; }
     .pete-card[data-held="1"] { transition: none; }
     /* The clock still drains — it is information, not decoration — but it stops
        pulsing at you, and a wrong answer stops shaking. */
@@ -2043,6 +2151,9 @@ html[data-phase="night"] {
     .pete-uno-card[data-glow="1"]::before { animation: none; }
     .pete-uno-card[data-glow="1"] .pete-uno-face::after { display: none; }
     .pete-uno-pending { animation: none; }
+    /* The grave still gets marked — that's information — it just doesn't fall in.
+       uno.js drops a single static headstone here rather than the full rockslide. */
+    .pete-uno-tomb { animation: none; transform: translate(-50%, -50%); }
   }
 }
 

internal/web/static/js/blackjack.js

@@ -265,13 +265,10 @@
     verdictEl.textContent = text;
     verdictEl.classList.remove("hidden");
 
-    // The one thing in this room that gets confetti. A natural is rare, it pays
-    // 3:2, and if everything celebrated then nothing would.
-    //
-    // The *sound* is not so precious: a win is a win and you should hear it. So
-    // the fanfare rides on the money, not on the confetti.
-    if (v.outcome === "blackjack") FX.burst(verdictEl, { count: 34 });
-    else if (v.net > 0) FX.sfx("win");
+    // Every win gets it to rain, because a win should feel like one. A natural is
+    // rarer and pays 3:2, so it keeps the confetti on top of the money as well.
+    if (v.outcome === "blackjack") { FX.burst(verdictEl, { count: 34 }); FX.moneyRain({ count: 30 }); }
+    else if (v.net > 0) FX.moneyRain();
     else if (v.net < 0) FX.sfx("lose");
     else FX.sfx("push");
   }

internal/web/static/js/casino-fx.js

@@ -319,6 +319,65 @@
     return Promise.all(done);
   }
 
+  // moneyRain: it rains money. The big finish on a win — bills and coins tumbling
+  // the whole height of the window, swaying and spinning as they fall. Louder than
+  // confetti, and it carries its own sound (a coin cascade) so it can stand in for
+  // the plain win fanfare wherever a table decides a win is worth the theatre.
+  //
+  // Like burst, the sound comes before the reduced-motion bail: no rain still
+  // deserves to be heard.
+  function moneyRain(opts) {
+    opts = opts || {};
+    if (opts.sound !== false) sfx(opts.sound || "jackpot");
+    if (reduced) return Promise.resolve();
+
+    var n = opts.count || 22;
+    var glyphs = opts.glyphs || ["💶", "💰", "🪙", "💵", "💴", "🤑"];
+    var vw = window.innerWidth || document.documentElement.clientWidth;
+    var vh = window.innerHeight || document.documentElement.clientHeight;
+    var done = [];
+
+    for (var i = 0; i < n; i++) {
+      var bit = document.createElement("div");
+      bit.className = "pete-money";
+      bit.textContent = glyphs[i % glyphs.length];
+      stage().appendChild(bit);
+
+      // Spread across the width in even lanes, each nudged off its lane so the
+      // curtain doesn't read as a grid. It sways sideways and spins on the way down.
+      var x = ((i + 0.5) / n) * vw + jitter(i, vw / n / 2);
+      var drift = jitter(i + 5, 80);
+      var startY = -50 - Math.abs(jitter(i + 2, 180));
+      var spin = jitter(i, 300);
+      var scale = 0.85 + Math.abs(jitter(i + 3, 0.55));
+
+      done.push(
+        bit
+          .animate(
+            [
+              { transform: t(x, startY, scale, 0), opacity: 0, offset: 0 },
+              { transform: t(x + drift, startY + 40, scale, spin * 0.2), opacity: 1, offset: 0.1 },
+              { transform: t(x - drift, vh * 0.55, scale, spin * 0.6), opacity: 1, offset: 0.6 },
+              { transform: t(x + drift * 0.5, vh + 60, scale, spin), opacity: 1, offset: 1 },
+            ],
+            {
+              duration: 1600 + Math.abs(jitter(i + 9, 1)) * 900,
+              easing: "cubic-bezier(0.35, 0.15, 0.55, 1)",
+              fill: "both",
+              delay: Math.abs(jitter(i, 320)),
+            }
+          )
+          .finished.catch(function () {})
+          .then(
+            (function (b) {
+              return function () { b.remove(); };
+            })(bit)
+          )
+      );
+    }
+    return Promise.all(done);
+  }
+
   // count rolls a number to a new value instead of swapping it. A chip count that
   // jumps is a variable; one that climbs is a payout.
   function count(el, to, opts) {
@@ -359,6 +418,7 @@
     flyMany: flyMany,
     spot: spot,
     burst: burst,
+    moneyRain: moneyRain,
     count: count,
     centre: centre,
   };

internal/web/static/js/casino-sfx.js

@@ -264,6 +264,17 @@
       });
     },
 
+    // It rains money. A bright run of coins spilling out over the win fanfare —
+    // ten metallic pings climbing a pentatonic scale, each with a tick on the
+    // front of it so it lands as coin rather than as bell.
+    jackpot: function (t) {
+      var notes = [784, 988, 1175, 1319, 1568, 1760];
+      for (var i = 0; i < 10; i++) {
+        tone(t + i * 0.05, notes[i % notes.length], { type: "triangle", decay: 0.13, gain: 0.09 });
+        hiss(t + i * 0.05, { freq: 5200, q: 3, decay: 0.02, gain: 0.05 });
+      }
+    },
+
     // Two notes down, and the second one is flat. Nobody needs telling twice.
     lose: function (t) {
       tone(t, 311.13, { type: "triangle", decay: 0.24, gain: 0.22 });
@@ -307,6 +318,43 @@
     tick: function (t) {
       hiss(t, { freq: 3200, q: 3, decay: 0.02, gain: 0.14 });
     },
+
+    // The mercy rule buries someone. Four ways to go, one sound each — uno.js
+    // rolls which animation plays and asks for the sound that matches it.
+    //
+    // Rocks coming down: a low rumble with tumbling knocks over the top, and a
+    // second slump as the pile settles.
+    rockslide: function (t) {
+      hiss(t, { filter: "lowpass", freq: 320, sweepTo: 140, decay: 0.5, gain: 0.34, q: 0.6 });
+      for (var i = 0; i < 6; i++) {
+        tone(t + i * 0.055, 128 - i * 9, { type: "square", decay: 0.1, gain: 0.09 });
+      }
+      hiss(t + 0.3, { filter: "lowpass", freq: 200, decay: 0.32, gain: 0.3, q: 0.5 });
+    },
+
+    // A headstone dropping in: one heavy stone thud that rings a little as it sets.
+    tombstone: function (t) {
+      tone(t, 92, { type: "sine", to: 58, glide: 0.16, decay: 0.42, gain: 0.32 });
+      hiss(t, { filter: "lowpass", freq: 520, decay: 0.12, gain: 0.34, q: 0.6 });
+      tone(t + 0.02, 184, { type: "triangle", decay: 0.5, gain: 0.08 });
+    },
+
+    // The Mega Man death: the pieces zip outward and the pitch falls away as they go.
+    zap: function (t) {
+      tone(t, 1250, { type: "sawtooth", to: 170, glide: 0.34, decay: 0.36, gain: 0.12 });
+      for (var i = 0; i < 4; i++) {
+        tone(t + i * 0.02, 940 - i * 130, { type: "square", decay: 0.06, gain: 0.06 });
+      }
+      hiss(t, { freq: 3000, sweepTo: 600, decay: 0.3, gain: 0.1, q: 0.8 });
+    },
+
+    // A coffin lid: two flat wooden knocks, the second lower and heavier.
+    coffin: function (t) {
+      tone(t, 150, { type: "triangle", decay: 0.14, gain: 0.26 });
+      hiss(t, { filter: "lowpass", freq: 820, decay: 0.05, gain: 0.24, q: 0.7 });
+      tone(t + 0.17, 108, { type: "triangle", decay: 0.22, gain: 0.28 });
+      hiss(t + 0.17, { filter: "lowpass", freq: 600, decay: 0.06, gain: 0.24, q: 0.7 });
+    },
   };
 
   // ---- the door --------------------------------------------------------------

internal/web/static/js/hangman.js

@@ -293,10 +293,10 @@
     verdictEl.textContent = text;
     verdictEl.classList.remove("hidden");
 
-    // Confetti for a phrase guessed outright — the one call you make on your own
-    // rather than by grinding the alphabet.
-    if (v.outcome === "solved" && v.net > 0) FX.burst(verdictEl, { count: 30 });
-    else if (v.net > 0) FX.sfx("win");
+    // A phrase guessed outright keeps the confetti — the one call you make on your
+    // own rather than by grinding the alphabet — and any win at all makes it rain.
+    if (v.outcome === "solved" && v.net > 0) { FX.burst(verdictEl, { count: 30 }); FX.moneyRain({ count: 28 }); }
+    else if (v.net > 0) FX.moneyRain();
     else if (v.net < 0) FX.sfx("lose");
   }
 

internal/web/static/js/holdem.js

@@ -370,7 +370,12 @@
         return pot.sweep(s.plate, e.amount, { gap: 55 }).then(function () {
           potTotal.textContent = money(pot.amount);
           moveStack(e.seat, e.amount);
-          if (e.seat === me && e.amount > 0) FX.burst(s.plate, { count: 18 });
+          if (e.seat === me && e.amount > 0) {
+            FX.burst(s.plate, { count: 18 });
+            // A real haul makes it rain; a blind-steal doesn't, or poker would be
+            // raining money every thirty seconds. Twenty big blinds is a pot.
+            if (view && view.tier && e.amount >= 20 * view.tier.bb) FX.moneyRain({ count: 24 });
+          }
           return wait(260);
         });
 

internal/web/static/js/solitaire.js

@@ -44,7 +44,10 @@
 
   var playing      = root.querySelector("[data-playing]");
   var betting      = root.querySelector("[data-betting]");
+  var playControls = root.querySelector("[data-play-controls]");
+  var wonControls  = root.querySelector("[data-won-controls]");
   var autoBtn      = root.querySelector("[data-auto]");
+  var finishBtn    = root.querySelector("[data-finish]");
   var cashBtn      = root.querySelector("[data-cash]");
   var cashAmountEl = root.querySelector("[data-cash-amount]");
   var startBtn     = root.querySelector("[data-start]");
@@ -258,6 +261,11 @@
     playing.classList.toggle("hidden", !live);
     betting.classList.toggle("hidden", live);
     if (!live) return;
+    // A won board has nothing left to decide, so the ordinary controls step aside
+    // for the one button that finishes it.
+    var won = !!v.won;
+    wonControls.classList.toggle("hidden", !won);
+    playControls.classList.toggle("hidden", won);
     autoBtn.disabled = !v.can_auto;
     cashAmountEl.textContent = (v.stands || 0).toLocaleString();
   }
@@ -545,6 +553,10 @@
 
   autoBtn.addEventListener("click", function () { drop(); send({ kind: "auto" }); });
 
+  // The finish button. On a won board a single auto drains every card home in one
+  // cascade, and the board settles cleared on the far end of it.
+  finishBtn.addEventListener("click", function () { drop(); send({ kind: "auto" }); });
+
   cashBtn.addEventListener("click", function () {
     drop();
     send({ kind: "concede" });
@@ -576,9 +588,9 @@
     verdictEl.textContent = text;
     verdictEl.classList.remove("hidden");
     // Clearing 52 cards out of a Vegas deal is the rarest thing that happens in
-    // this room, so it's the one that gets the confetti.
-    if (v.outcome === "cleared") FX.burst(verdictEl, { count: 40 });
-    else if (v.net > 0) FX.sfx("win");
+    // this room, so it keeps the confetti — but any win now makes it rain.
+    if (v.outcome === "cleared") { FX.burst(verdictEl, { count: 40 }); FX.moneyRain({ count: 34 }); }
+    else if (v.net > 0) FX.moneyRain();
     else if (v.net < 0) FX.sfx("lose");
     else FX.sfx("push");
   }

internal/web/static/js/trivia.js

@@ -307,8 +307,9 @@
     verdictEl.textContent = text;
     verdictEl.classList.remove("hidden");
 
-    // Confetti only for clearing all twelve — the one thing in here worth it.
-    if (v.outcome === "cleared") FX.burst(verdictEl, { count: 34 });
+    // Clearing all twelve keeps the confetti on top; any win at all makes it rain.
+    if (v.outcome === "cleared") { FX.burst(verdictEl, { count: 34 }); FX.moneyRain({ count: 30 }); }
+    else if (v.net > 0) FX.moneyRain();
   }
 
   function setPhase(v) {

internal/web/static/js/uno.js

@@ -304,12 +304,22 @@
       colourEl.textContent = "";
       if (feltEl) feltEl.dataset.c = "";
     }
-    pending(live(v) ? (v.pending || 0) : 0);
+    pending(live(v) ? (v.pending || 0) : 0, v);
   }
 
-  function pending(n) {
+  // Who the running stack lands on next: during a stack phase that's whoever's
+  // turn it is. Fall back to the view the caller passed, then to the live game.
+  function pendingTarget(v) {
+    var src = v || game;
+    if (!src) return "you";
+    if (src.turn === me) return "you";
+    var s = (src.seats && src.seats[src.turn]) || null;
+    return (s && s.name) || "them";
+  }
+
+  function pending(n, v) {
     if (billEl) {
-      billEl.textContent = n > 0 ? "+" + n + " on you" : "";
+      billEl.textContent = n > 0 ? "+" + n + " on " + pendingTarget(v) : "";
       billEl.classList.toggle("hidden", n <= 0);
     }
     if (takeN) takeN.textContent = String(n);
@@ -355,7 +365,7 @@
     if (!text) { verdictEl.classList.add("hidden"); return; }
     verdictEl.textContent = text;
     verdictEl.classList.remove("hidden");
-    if (v.winner === me && v.outcome !== "tie") FX.burst(verdictEl, { count: 34 });
+    if (v.winner === me && v.outcome !== "tie") { FX.burst(verdictEl, { count: 34 }); FX.moneyRain({ count: 30 }); }
     else if (v.winner >= 0 && v.winner !== me) FX.sfx("lose");
   }
 
@@ -475,6 +485,80 @@
     return new Promise(function (r) { setTimeout(function () { b.remove(); r(); }, 900); });
   }
 
+  // bury gives the mercy rule some ceremony. It rolls one of four send-offs and
+  // drops it over the buried seat — or over your hand, if it's you going down —
+  // with the noise that goes with it. Every piece is built from scratch and
+  // clears itself, so a repaint that lands mid-fall just cuts it short. Resolves
+  // on the dramatic beat, not on cleanup: the hand shouldn't wait for the dust.
+  var BURIALS = ["rocks", "tomb", "zap", "coffin"];
+
+  function bury(seat) {
+    var host = seat === me ? handEl : seatEl(seat);
+    if (!host) return Promise.resolve();
+
+    var wrap = document.createElement("div");
+    wrap.className = "pete-uno-bury";
+    host.appendChild(wrap);
+
+    // No theatre for reduced motion: a single static headstone marks the grave,
+    // with the stone-drop thud so it isn't silent either.
+    if (reduced) {
+      FX.sfx("tombstone");
+      var stone = document.createElement("div");
+      stone.className = "pete-uno-tomb";
+      stone.textContent = "🪦";
+      wrap.appendChild(stone);
+      setTimeout(function () { wrap.remove(); }, 1400);
+      return Promise.resolve();
+    }
+
+    var kind = BURIALS[Math.floor(Math.random() * BURIALS.length)];
+    wrap.dataset.kind = kind;
+
+    if (kind === "rocks") {
+      FX.sfx("rockslide");
+      [
+        { dx: "-1.15rem", dy: "0.55rem", rot: "-20deg", d: 0 },
+        { dx: "0.95rem",  dy: "0.7rem",  rot: "24deg",  d: 70 },
+        { dx: "-0.15rem", dy: "0.15rem", rot: "8deg",   d: 150 },
+        { dx: "-1.5rem",  dy: "1.0rem",  rot: "-34deg", d: 220 },
+        { dx: "1.45rem",  dy: "0.95rem", rot: "16deg",  d: 300 },
+        { dx: "0.35rem",  dy: "1.05rem", rot: "-10deg", d: 360 },
+      ].forEach(function (r) {
+        var el = document.createElement("div");
+        el.className = "pete-uno-rock";
+        el.textContent = "🪨";
+        el.style.setProperty("--dx", r.dx);
+        el.style.setProperty("--dy", r.dy);
+        el.style.setProperty("--rot", r.rot);
+        el.style.setProperty("--d", r.d + "ms");
+        wrap.appendChild(el);
+      });
+    } else if (kind === "zap") {
+      FX.sfx("zap");
+      var flash = document.createElement("div");
+      flash.className = "pete-uno-zap-flash";
+      wrap.appendChild(flash);
+      for (var a = 0; a < 8; a++) {
+        var bit = document.createElement("div");
+        bit.className = "pete-uno-zap-bit";
+        bit.style.setProperty("--ang", (a * 45) + "deg");
+        wrap.appendChild(bit);
+      }
+    } else {
+      // tomb or coffin: one heavy thing drops in and sets.
+      FX.sfx(kind === "tomb" ? "tombstone" : "coffin");
+      var mark = document.createElement("div");
+      mark.className = kind === "tomb" ? "pete-uno-tomb" : "pete-uno-coffin";
+      mark.textContent = kind === "tomb" ? "🪦" : "⚰️";
+      wrap.appendChild(mark);
+    }
+
+    // The zap is gone in half a second; the graves linger before they clear.
+    setTimeout(function () { wrap.remove(); }, kind === "zap" ? 650 : 1500);
+    return new Promise(function (r) { setTimeout(r, kind === "zap" ? 480 : 640); });
+  }
+
   // play walks the server's script for a move the acting player just made.
   function play(view) {
     var events = view.uno_events || [];
@@ -570,7 +654,7 @@
           }
 
           case "stack":
-            pending(e.n);
+            pending(e.n, final);
             spotlight(e.seat);
             FX.sfx("bad");
             return badge(e.seat, "+" + e.n, "bad").then(function () { return wait(140); });
@@ -614,8 +698,12 @@
             bump(e.seat, 0);
             showHand(e.hand);
             pending(0);
-            FX.sfx("bad");
-            return badge(e.seat, "Buried on " + e.n, "bad").then(function () { return wait(460); });
+            // bury() rolls the send-off and makes its own noise; the badge rides
+            // alongside it so you still see what count did them in.
+            return Promise.all([
+              bury(e.seat),
+              badge(e.seat, "Buried on " + e.n, "bad"),
+            ]).then(function () { return wait(300); });
           }
 
           case "skip":

internal/web/templates/solitaire.html

@@ -86,7 +86,9 @@
 
   <!-- Playing: shown while a board is live. -->
   <section data-playing class="hidden rounded-3xl bg-[color:var(--card)] p-5 sm:p-6 shadow-pete border-2 border-[color:var(--ink)]/10">
-    <div class="flex flex-wrap items-center gap-3">
+
+    <!-- The ordinary controls, while there's still a game to play. -->
+    <div data-play-controls class="flex flex-wrap items-center gap-3">
       <button type="button" data-auto
               class="rounded-full bg-[color:var(--ink)]/5 px-5 py-2.5 font-display font-bold border-2 border-[color:var(--ink)]/10
                      hover:bg-[color:var(--ink)]/10 active:translate-y-px disabled:opacity-40 disabled:pointer-events-none transition">
@@ -103,6 +105,22 @@
         Cash the board · <span data-cash-amount class="tabular-nums">0</span>
       </button>
     </div>
+
+    <!-- The board's won: every card's face up and the piles are drained, so
+         there's nothing left to decide. One press sends the lot home. -->
+    <div data-won-controls class="hidden">
+      <div class="flex flex-wrap items-center gap-3">
+        <button type="button" data-finish
+                class="pete-finish rounded-full bg-[color:var(--accent)] px-8 py-3 font-display text-lg font-bold text-white shadow-pete
+                       hover:brightness-105 active:translate-y-px disabled:pointer-events-none transition">
+          You've cracked it. Send them all home 🎉
+        </button>
+        <p class="text-xs text-[color:var(--ink)]/45">
+          The whole board's face up now, so the rest plays itself.
+        </p>
+      </div>
+    </div>
+
     <p data-game-msg class="hidden mt-3 rounded-2xl bg-[color:var(--ink)]/5 px-4 py-2 text-sm font-semibold"></p>
   </section>