diff --git a/css/app.css b/css/app.css
index 4bdfaa9..14cdd0b 100644
--- a/css/app.css
+++ b/css/app.css
@@ -82,6 +82,7 @@ html, body {
   margin: 0;
   min-height: 1.4em;
   max-width: 32ch;
+  white-space: pre-line;
   color: var(--fg);
   opacity: 0.75;
   font-size: clamp(0.95rem, 4vw, 1.1rem);
diff --git a/js/audio.js b/js/audio.js
index 1b36fb6..1086c17 100644
--- a/js/audio.js
+++ b/js/audio.js
@@ -45,7 +45,14 @@ export function unlockAudio() {
       const d = noiseBuf.getChannelData(0);
       for (let i = 0; i < d.length; i++) d[i] = Math.random() * 2 - 1;
     }
-    if (ctx.state !== 'running') ctx.resume().catch(() => {});
+    if (ctx.state !== 'running') {
+      ctx.resume().catch(() => {});
+      // Older iOS Safari only unlocks once a sound starts inside the gesture.
+      const src = ctx.createBufferSource();
+      src.buffer = ctx.createBuffer(1, 1, ctx.sampleRate);
+      src.connect(ctx.destination);
+      src.start();
+    }
   } catch {
     /* audio unavailable */
   }
@@ -56,7 +63,10 @@ export function installAudioUnlock() {
   for (const t of ['pointerdown', 'pointerup', 'touchend', 'click', 'keydown']) window.addEventListener(t, unlockAudio, opts);
 }
 
-const live = () => ctx && ctx.state === 'running' && !muted;
+/** False until the browser has let us start audio (needs a tap, not just a touch down). */
+export const audioUnlocked = () => !!ctx && ctx.state === 'running';
+
+const live = () => audioUnlocked() && !muted;
 
 function tone({ type = 'sine', freq, freqEnd, at = 0, dur, gain = 0.2, attack = 0.005, filter }) {
   const t0 = ctx.currentTime + at;
diff --git a/js/i18n.js b/js/i18n.js
index e594521..284bdcf 100644
--- a/js/i18n.js
+++ b/js/i18n.js
@@ -24,6 +24,7 @@ export const translations = {
     lastStanding: 'Last one standing!',
     tapRestart: 'Tap to play again',
     desktopHint: 'On a computer? Add ?debug=1 to the address to test with a mouse.',
+    tapForSound: '🔈 Tap the screen once to turn on sound',
     team: 'Team {name}',
 
     modeLabel: 'Mode',
@@ -90,6 +91,7 @@ export const translations = {
     lastStanding: 'Laatste overlevende!',
     tapRestart: 'Tik om opnieuw te spelen',
     desktopHint: 'Op een computer? Zet ?debug=1 achter het adres om met de muis te testen.',
+    tapForSound: '🔈 Tik één keer op het scherm voor geluid',
     team: 'Team {name}',
 
     modeLabel: 'Modus',
diff --git a/js/input.js b/js/input.js
index d3e4bfe..2923801 100644
--- a/js/input.js
+++ b/js/input.js
@@ -1,5 +1,7 @@
 // Pointer input. Fingers are tracked by pointerId; pointercancel counts as
 // a lift (Android cancels touches it thinks are palms or system gestures).
+// Browsers may recycle pointerIds, while the game keeps lifted fingers on
+// screen after a round, so every touch gets its own never-reused finger id.
 //
 // Debug mode (?debug=1): mouse clicks place persistent fake fingers.
 // Click a fake finger again to remove it; drag it to move it.
@@ -8,7 +10,8 @@
 const DRAG_THRESHOLD = 6;
 
 export function createInput(canvas, { debug, onDown, onMove, onUp }) {
-  const active = new Set(); // real pointer ids currently down
+  const active = new Map(); // pointerId -> finger id, for touches currently down
+  let touchSeq = 0;
   const fakes = new Map(); // fake id -> {x, y}
   let fakeSeq = 0;
   let mouse = null; // {pointerId, fakeId, startX, startY, moved, created}
@@ -17,8 +20,10 @@ export function createInput(canvas, { debug, onDown, onMove, onUp }) {
   const hitRadius = () => Math.max(40, Math.min(64, Math.min(innerWidth, innerHeight) * 0.115));
 
   function release(pointerId) {
-    if (!active.delete(pointerId)) return;
-    onUp(String(pointerId), now());
+    const id = active.get(pointerId);
+    if (id == null) return;
+    active.delete(pointerId);
+    onUp(id, now());
   }
 
   canvas.addEventListener('pointerdown', (e) => {
@@ -32,14 +37,16 @@ export function createInput(canvas, { debug, onDown, onMove, onUp }) {
     } catch {
       /* not fatal */
     }
-    active.add(e.pointerId);
-    onDown(String(e.pointerId), e.clientX, e.clientY, now());
+    release(e.pointerId); // a recycled id whose lift we never saw
+    const id = `t${++touchSeq}`;
+    active.set(e.pointerId, id);
+    onDown(id, e.clientX, e.clientY, now());
   });
 
   canvas.addEventListener('pointermove', (e) => {
     if (mouse && e.pointerId === mouse.pointerId) return debugMove(e);
-    if (!active.has(e.pointerId)) return;
-    onMove(String(e.pointerId), e.clientX, e.clientY);
+    const id = active.get(e.pointerId);
+    if (id != null) onMove(id, e.clientX, e.clientY);
   });
 
   const up = (e) => {
diff --git a/js/renderer.js b/js/renderer.js
index 5dde596..41d356b 100644
--- a/js/renderer.js
+++ b/js/renderer.js
@@ -75,7 +75,7 @@ export class Renderer {
           data.style === 'teams'
             ? game.players.map((id) => game.rings.get(id)).filter(Boolean).map((ring) => ({ ring, color: this.theme.team[game.plan.teams.get(ring.id)] }))
             : data.winners.map((id) => game.rings.get(id)).filter(Boolean).map((ring) => ({ ring, color: this.colorOf(ring) }));
-        this.reveal = createReveal(data.style, { targets, w: this.w, h: this.h, R, start: now, palette: this.theme.colors });
+        this.reveal = createReveal(data.style, { targets, view: this, start: now, palette: this.theme.colors });
         break;
       }
       case 'phase':
diff --git a/js/reveals.js b/js/reveals.js
index fa4a4c5..aed13be 100644
--- a/js/reveals.js
+++ b/js/reveals.js
@@ -16,18 +16,20 @@ function farthestCorner(x, y, w, h) {
 
 /**
  * @param {string} style flood | confetti | spotlight | shockwave | calm | teams
- * @param {{targets:{ring:{x:number,y:number}, color:string}[], w:number, h:number, R:number, start:number, palette:string[]}} o
+ * @param {{targets:{ring:{x:number,y:number}, color:string}[], view:{w:number,h:number,R:number}, start:number, palette:string[]}} o
+ *   `view` is read every frame so the effect follows resizes (e.g. entering fullscreen).
  */
 export function createReveal(style, o) {
   const make = { flood, confetti, spotlight, shockwave, calm, teams }[style] || calm;
   return { winnerWhite: false, drawBack() {}, drawFront() {}, shake: null, ...make(o) };
 }
 
-function flood({ targets, w, h, start }) {
+function flood({ targets, view, start }) {
   const single = targets.length === 1;
   return {
     winnerWhite: true,
     drawBack(g, now) {
+      const { w, h, R } = view;
       const k = easeInOutCubic(clamp01((now - start) / 850));
       g.globalAlpha = single ? 1 : 0.8;
       for (const { ring, color } of targets) {
@@ -51,7 +53,7 @@ function flood({ targets, w, h, start }) {
   };
 }
 
-function confetti({ targets, w, h, R, start, palette }) {
+function confetti({ targets, view, start, palette }) {
   const parts = [];
   const per = Math.round(170 / targets.length);
   for (const { ring, color } of targets) {
@@ -82,6 +84,7 @@ function confetti({ targets, w, h, R, start, palette }) {
   const grav = 1100;
   return {
     drawBack(g, now) {
+      const { w, h, R } = view;
       const k = clamp01((now - start) / 700);
       for (const { ring, color } of targets) {
         const grad = g.createRadialGradient(ring.x, ring.y, R, ring.x, ring.y, Math.max(w, h));
@@ -92,6 +95,7 @@ function confetti({ targets, w, h, R, start, palette }) {
       }
     },
     drawFront(g, now) {
+      const { w, h, R } = view;
       const T = (now - start) / 1000;
       for (const p of parts) {
         const t = T - p.delay;
@@ -118,16 +122,15 @@ function confetti({ targets, w, h, R, start, palette }) {
   };
 }
 
-function spotlight({ targets, w, h, R, start }) {
+function spotlight({ targets, view, start }) {
   // Darkness is drawn at half resolution: it's all soft gradients anyway.
   const scale = 0.5;
   const off = document.createElement('canvas');
-  off.width = Math.ceil(w * scale);
-  off.height = Math.ceil(h * scale);
   const o = off.getContext('2d');
-  const spots = targets.map(() => ({ sx: Math.random() * w, sy: Math.random() * h * 0.6, ph: Math.random() * 6 }));
+  const spots = targets.map(() => ({ sx: Math.random() * view.w, sy: Math.random() * view.h * 0.6, ph: Math.random() * 6 }));
   return {
     drawBack(g, now) {
+      const { w, h, R } = view;
       const k = clamp01((now - start - 900) / 500);
       if (!k) return;
       for (const { ring, color } of targets) {
@@ -139,7 +142,14 @@ function spotlight({ targets, w, h, R, start }) {
       }
     },
     drawFront(g, now) {
+      const { w, h, R } = view;
       const t = (now - start) / 1000;
+      const ow = Math.ceil(w * scale);
+      const oh = Math.ceil(h * scale);
+      if (off.width !== ow || off.height !== oh) {
+        off.width = ow;
+        off.height = oh;
+      }
       o.setTransform(scale, 0, 0, scale, 0, 0);
       o.globalCompositeOperation = 'source-over';
       o.clearRect(0, 0, w, h);
@@ -164,7 +174,7 @@ function spotlight({ targets, w, h, R, start }) {
   };
 }
 
-function shockwave({ targets, w, h, R, start }) {
+function shockwave({ targets, view, start }) {
   const delays = [0, 0.14, 0.3];
   return {
     shake(now) {
@@ -174,6 +184,7 @@ function shockwave({ targets, w, h, R, start }) {
       return [Math.sin(now * 0.09) * amp, Math.cos(now * 0.113) * amp];
     },
     drawBack(g, now) {
+      const { w, h, R } = view;
       const t = (now - start) / 1000;
       for (const { ring, color } of targets) {
         g.fillStyle = hexToRgba(color, 0.25 * clamp01((t - 0.2) / 0.6));
@@ -197,6 +208,7 @@ function shockwave({ targets, w, h, R, start }) {
       }
     },
     drawFront(g, now) {
+      const { w, h, R } = view;
       const t = (now - start) / 1000;
       if (t < 0.15) {
         g.fillStyle = `rgba(255,255,255,${0.55 * (1 - t / 0.15)})`;
@@ -207,9 +219,10 @@ function shockwave({ targets, w, h, R, start }) {
 }
 
 /** prefers-reduced-motion: a slow, gentle colour fade. */
-function calm({ targets, w, h, R, start }) {
+function calm({ targets, view, start }) {
   return {
     drawBack(g, now) {
+      const { w, h, R } = view;
       const k = easeInOutCubic(clamp01((now - start) / 1200));
       for (const { ring, color } of targets) {
         const grad = g.createRadialGradient(ring.x, ring.y, R, ring.x, ring.y, Math.max(w, h) * 0.9);
@@ -222,9 +235,10 @@ function calm({ targets, w, h, R, start }) {
   };
 }
 
-function teams({ targets, R, start }) {
+function teams({ targets, view, start }) {
   return {
     drawBack(g, now) {
+      const { w, h, R } = view;
       const k = easeOutCubic(clamp01((now - start) / 700));
       for (const { ring, color } of targets) {
         const r = R * (1.5 + 2.5 * k);
diff --git a/js/ui.js b/js/ui.js
index 69d9100..88b39ab 100644
--- a/js/ui.js
+++ b/js/ui.js
@@ -4,7 +4,7 @@ import { t, setLang, getLang, detectLang, LANGS } from './i18n.js';
 import { MODES } from './modes.js';
 import { TIMING } from './game.js';
 import { pick } from './random.js';
-import { canVibrate } from './audio.js';
+import { canVibrate, audioUnlocked } from './audio.js';
 import { fullscreenSupported, isFullscreen, toggleFullscreen, onFullscreenChange } from './device.js';
 
 const $ = (sel) => document.querySelector(sel);
@@ -207,7 +207,13 @@ export function createUI({ settings, debug, showDesktopHint }) {
     const count = game.activeRings().length;
     switch (game.phase) {
       case 'idle':
-        if (count === 0) return [t('hint'), showDesktopHint ? t('desktopHint') : modeSummary(s), 'hint'];
+        if (count === 0) {
+          if (showDesktopHint) return [t('hint'), t('desktopHint'), 'hint'];
+          // Browsers only allow sound after a tap (a finger *lift*), so ask for one.
+          const soundHint = !s.muted && !audioUnlocked() ? `
+${t('tapForSound')}` : '';
+          return [t('hint'), modeSummary(s) + soundHint, 'hint'];
+        }
         return [t('needMore'), modeSummary(s), 'hint'];
       case 'gathering':
         return [t('holdStill'), '', 'soft'];
diff --git a/sw.js b/sw.js
index a2d4bea..fba856c 100644
--- a/sw.js
+++ b/sw.js
@@ -2,7 +2,7 @@
 // cache fallback so updates show up immediately when online and the app
 // still works fully offline. Bump VERSION when the file list changes.
 
-const VERSION = 'picker-v1';
+const VERSION = 'picker-v2';
 const SHELL = [
   './',
   './index.html',
diff --git a/tests/logic.html b/tests/logic.html
index f59d2c9..15fec31 100644
--- a/tests/logic.html
+++ b/tests/logic.html
@@ -14,6 +14,8 @@
 import { Game, TIMING } from '../js/game.js';
 import { planRound, makeHighlightSchedule } from '../js/modes.js';
 import { randomInt } from '../js/random.js';
+import { createInput } from '../js/input.js';
+import { createReveal } from '../js/reveals.js';
 
 const results = [];
 function test(name, fn) {
@@ -270,6 +272,47 @@ test('unknown pointer ids and double lifts are harmless', () => {
   assert(h.game.rings.size === 0, 'pruned');
 });
 
+test('recycled pointerIds still restart after a round (input -> game)', () => {
+  const h = setup();
+  const canvas = document.createElement('canvas');
+  document.body.append(canvas);
+  createInput(canvas, {
+    debug: false,
+    onDown: (id, x, y) => h.game.fingerDown(id, x, y, h.now),
+    onMove: (id, x, y) => h.game.fingerMove(id, x, y),
+    onUp: (id) => h.game.fingerUp(id, h.now),
+  });
+  const fire = (type, pointerId, x = 50, y = 50) =>
+    canvas.dispatchEvent(new PointerEvent(type, { pointerId, pointerType: 'touch', clientX: x, clientY: y, bubbles: true, cancelable: true }));
+  fire('pointerdown', 1, 50, 50);
+  fire('pointerdown', 2, 250, 250);
+  h.until('result');
+  fire('pointerup', 1);
+  fire('pointerup', 2);
+  h.run(TIMING.restartGraceMs + 100);
+  assert(h.game.canRestart(h.now), 'can restart');
+  fire('pointerdown', 1); // the browser reuses pointerId 1 for the tap
+  assert(h.game.phase === 'idle' && h.count('restart') === 1, 'tap with a recycled pointerId restarts, phase ' + h.game.phase);
+  fire('pointerup', 1);
+  h.run(500);
+  assert(h.game.rings.size === 0, 'tap ring removed');
+  canvas.remove();
+});
+
+test('reveal follows a resize (entering fullscreen) without leaving an unpainted strip', () => {
+  const c = document.createElement('canvas');
+  c.width = 100;
+  c.height = 200;
+  const g = c.getContext('2d');
+  const view = { w: 100, h: 100, R: 10 };
+  const ring = { x: 50, y: 50 };
+  const fx = createReveal('flood', { targets: [{ ring, color: '#ff0000' }], view, start: 0, palette: ['#ff0000'] });
+  view.h = 200; // screen grew after the reveal started
+  fx.drawBack(g, 5000);
+  const px = g.getImageData(50, 190, 1, 1).data;
+  assert(px[0] > 100 && px[3] === 255, 'bottom painted, got ' + Array.from(px));
+});
+
 // Service worker: parses, and every precached file exists.
 try {
   const src = await (await fetch('../sw.js')).text();