Models 44

GPT-6.1 Terra

by OpenAIReasoningClean
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Running live in a sandboxed frame. Click inside it before using the keyboard.

How it went

Total time
1 min 24 s
Cost
$0.038
Output tokens
7,416
Spent thinking
1,034 tokens
Speed
96.2 tok/s
Console errors
0
First token after
6.6 s
First visible text after
26.6 s
Prompt tokens
493
Code size
19.1 KB
Finish reason
stop
Served by
OpenAI
Model id
openai/gpt-6.1-terra
Reasoning sent
{"effort":"medium"}
Max output
128,000 tokens
Generated
Nov 12, 2026

What it was asked

The prompt
Build a polished Snake game in a single HTML file using vanilla JavaScript and a <canvas>. Requirements: - A grid of at least 20×20 cells, centered on the page. - Arrow keys and WASD control the snake. Quick successive key presses must both be honored, but the snake can never reverse onto itself. - Eating food adds 10 points and grows the snake by one cell; new food never spawns on the snake. - Game over when the snake hits a wall or itself, with an overlay showing the score; Space or Enter restarts, P pauses. - Visual polish: smooth movement, a snake with a distinct head and eyes facing its direction, and a small particle burst when eating. - Display the current score and the best score of the session.
System prompt, sent with every prompt
You are generating a self-contained web demo. It will be rendered automatically in a sandboxed iframe and compared side by side with the output of other AI models given the exact same task.

Output rules:
- Reply with exactly ONE fenced code block containing the complete file: ```html (or ```svg when the task asks for an SVG). No text before or after the code block.
- Everything must be inline: CSS in <style>, JavaScript in <script>. No external files, images, fonts or network requests, except the CDN URLs explicitly allowed by the task.
- Do not use localStorage, sessionStorage, cookies, IndexedDB, alert(), confirm(), prompt() or window.open(): they are blocked in the sandbox and will throw.
- The page must look right in a 1280×800 viewport and adapt gracefully down to 375px wide. No horizontal scrollbar.
- Something meaningful must be visible on first paint: a screenshot is taken automatically about 3 seconds after load, without any interaction.
- Everything that makes the demo interesting must be visible within the first seconds: nothing hidden behind a high score, a later level or a long play session.
- Games must start in a self-playing demo mode (a simple AI plays) behind a "Click or press a key to start" message, so the game can be judged in action without playing.
- The iframe only receives keyboard events after the user clicks it: if the demo uses the keyboard, display a clear "Click or press a key to start" message.
- The code must run with zero errors in the console of the latest Chrome.

Code run-1.html · 453 lines

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Snake Club</title>
<style>
  :root {
    color-scheme: dark;
    --bg: #0b110f;
    --panel: #121d19;
    --line: #27382f;
    --muted: #84978a;
    --green: #b9f36b;
    --cream: #eaf1df;
  }
  * { box-sizing: border-box; }
  body {
    margin: 0;
    min-height: 100vh;
    color: var(--cream);
    background:
      radial-gradient(ellipse at 50% 35%, #1b2d20 0%, #0d1611 43%, #090f0c 100%);
    font-family: "Segoe UI", Arial, sans-serif;
  }
  body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    opacity: .16;
    background-image: radial-gradient(#9cba9d 0.5px, transparent 0.5px);
    background-size: 5px 5px;
  }
  .shell { max-width: 1220px; margin: auto; padding: 0 30px 28px; position: relative; }
  header {
    height: 79px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid #293a30;
  }
  .brand { display: flex; align-items: center; gap: 11px; font-weight: 800; letter-spacing: .13em; font-size: 13px; }
  .brand-mark {
    width: 34px; height: 34px; border-radius: 10px; background: var(--green);
    display: grid; place-items: center; color: #172716; font-size: 19px; letter-spacing: 0;
    box-shadow: 0 0 24px #b9f36b25;
  }
  .brand small { display: block; color: #84978a; font-size: 8px; letter-spacing: .2em; margin-top: 3px; }
  .header-right { color: #84978a; font-size: 10px; font-weight: 700; letter-spacing: .16em; display: flex; align-items: center; gap: 10px; }
  .header-right .dot, .live-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 10px #a8e76b; }
  main {
    display: grid;
    grid-template-columns: minmax(170px, 210px) minmax(0, 560px) minmax(170px, 210px);
    justify-content: center;
    gap: 28px;
    padding-top: 30px;
    align-items: start;
  }
  .side { padding-top: 54px; }
  .eyebrow { color: #9cb19f; font-size: 10px; font-weight: 800; letter-spacing: .18em; text-transform: uppercase; }
  .intro h1 { font-size: 33px; line-height: 1.08; letter-spacing: -.045em; margin: 15px 0 12px; font-weight: 750; }
  .intro h1 span { color: var(--green); }
  .intro p { margin: 0; color: #84978a; font-size: 13px; line-height: 1.65; max-width: 190px; }
  .stat {
    margin-top: 34px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: linear-gradient(145deg, #17251d, #111b16);
    padding: 17px 18px;
    box-shadow: 0 12px 30px #0002;
  }
  .stat-head { display: flex; align-items: center; justify-content: space-between; }
  .stat-icon { color: var(--green); font-size: 17px; }
  .stat-value { font-size: 41px; font-weight: 700; letter-spacing: -.055em; margin-top: 11px; line-height: 1; font-variant-numeric: tabular-nums; }
  .stat-note { color: #73877a; font-size: 11px; margin-top: 9px; }
  .right .stat { margin-top: 0; }
  .guide { margin-top: 27px; padding: 0 2px; }
  .guide-title { padding-bottom: 14px; border-bottom: 1px solid var(--line); }
  .guide-row { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding-top: 16px; color: #9aab9e; font-size: 11px; }
  .keys { display: flex; gap: 3px; flex-shrink: 0; }
  kbd { min-width: 22px; height: 23px; display: inline-grid; place-items: center; border: 1px solid #405347; border-bottom-width: 2px; border-radius: 5px; color: #d2ded0; background: #1b2921; font: 10px "Segoe UI", sans-serif; padding: 0 4px; }
  .tip { margin-top: 30px; border-left: 2px solid #a9e764; padding-left: 12px; color: #829588; font-size: 11px; line-height: 1.6; }
  .board-heading { height: 36px; display: flex; justify-content: space-between; align-items: flex-start; }
  .board-heading .eyebrow { color: #d9e6d7; }
  .board-heading .number { color: #6d8273; font-size: 10px; font-weight: 700; letter-spacing: .13em; }
  .board-frame {
    position: relative;
    padding: 7px;
    border: 1px solid #425747;
    border-radius: 15px;
    background: #1a2a20;
    box-shadow: 0 24px 65px #0007, 0 0 40px #85c6670b, inset 0 1px #ffffff12;
  }
  .board-inner { position: relative; border-radius: 9px; overflow: hidden; background: #101b15; }
  canvas { display: block; width: 100%; aspect-ratio: 1; touch-action: manipulation; }
  .mode {
    position: absolute; left: 15px; top: 15px; display: flex; gap: 7px; align-items: center;
    padding: 7px 9px; border: 1px solid #ffffff18; border-radius: 6px;
    background: #101a14df; color: #b9cbb9; font-size: 9px; font-weight: 800; letter-spacing: .12em;
    pointer-events: none;
  }
  .mode .live-dot { width: 6px; height: 6px; }
  .start-hint {
    position: absolute; left: 50%; bottom: 18px; transform: translateX(-50%);
    width: max-content; max-width: calc(100% - 24px);
    border: 1px solid #8db96c60; border-radius: 10px;
    background: #0d1711ed; padding: 11px 20px; text-align: center;
    box-shadow: 0 8px 25px #0008; cursor: pointer;
  }
  .start-hint strong { display: block; color: #ecf5e4; font-size: 11px; letter-spacing: .08em; }
  .start-hint span { display: block; color: #8da38e; font-size: 10px; margin-top: 4px; }
  .cover {
    position: absolute; inset: 0; display: none; align-items: center; justify-content: center;
    background: #08110bd9; text-align: center; backdrop-filter: blur(3px);
  }
  .cover.show { display: flex; }
  .cover-box { padding: 28px; }
  .cover-icon { color: var(--green); font-size: 25px; }
  .cover h2 { font-size: 34px; letter-spacing: -.04em; margin: 10px 0 7px; }
  .cover p { color: #9db09e; font-size: 13px; margin: 0 0 22px; }
  .cover button {
    border: 0; border-radius: 8px; background: var(--green); color: #192a16;
    padding: 12px 21px; font-weight: 800; font-size: 11px; letter-spacing: .06em; cursor: pointer;
  }
  .board-footer { display: flex; justify-content: space-between; color: #718678; font-size: 10px; font-weight: 700; letter-spacing: .1em; padding: 14px 3px; }
  .board-footer span:last-child { color: #98b398; }
  @media (max-width: 850px) {
    .shell { padding: 0 20px 30px; }
    main { grid-template-columns: minmax(0, 560px); gap: 0; padding-top: 22px; }
    .center { grid-row: 1; }
    .side { padding-top: 12px; }
    .left { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; align-items: stretch; }
    .intro { padding: 14px 0; }
    .intro h1 { font-size: 25px; margin: 8px 0; }
    .intro p { font-size: 12px; }
    .left .stat { margin: 0; }
    .right { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
    .guide { margin: 0; }
    .tip { display: none; }
  }
  @media (max-width: 430px) {
    .shell { padding-left: 14px; padding-right: 14px; }
    header { height: 64px; }
    .header-right { font-size: 8px; }
    main { padding-top: 16px; }
    .board-frame { padding: 5px; }
    .start-hint { padding: 9px 12px; bottom: 10px; }
    .start-hint strong { font-size: 9px; }
    .board-footer { font-size: 9px; }
    .stat { padding: 14px; }
    .stat-value { font-size: 34px; }
    .intro h1 { font-size: 22px; }
  }
</style>
</head>
<body>
<div class="shell">
  <header>
    <div class="brand"><div class="brand-mark">S</div><div>SNAKE CLUB<small>THE ARCADE COLLECTION</small></div></div>
    <div class="header-right"><span class="dot"></span> GOOD TO SEE YOU HERE</div>
  </header>

  <main>
    <aside class="side left">
      <div class="intro">
        <div class="eyebrow">01 / THE CLASSIC</div>
        <h1>One more<br><span>little bite.</span></h1>
        <p>A familiar game, made for a little moment of escape.</p>
      </div>
      <div class="stat">
        <div class="stat-head"><span class="eyebrow">SCORE</span><span class="stat-icon">✳</span></div>
        <div class="stat-value" id="score">0</div>
        <div class="stat-note">Keep it growing</div>
      </div>
    </aside>

    <section class="center">
      <div class="board-heading"><span class="eyebrow">THE PLAYING FIELD</span><span class="number">24 × 24 GRID</span></div>
      <div class="board-frame">
        <div class="board-inner">
          <canvas id="game" width="720" height="720" aria-label="Snake game board"></canvas>
          <div class="mode" id="mode"><span class="live-dot"></span><span id="modeText">DEMO MODE</span></div>
          <div class="start-hint" id="startHint">
            <strong>CLICK OR PRESS A KEY TO START</strong>
            <span>Take over when you're ready</span>
          </div>
          <div class="cover" id="cover">
            <div class="cover-box">
              <div class="cover-icon" id="coverIcon">✳</div>
              <h2 id="coverTitle">Game over</h2>
              <p id="coverText">You scored 0 points.</p>
              <button id="coverButton">PLAY AGAIN &nbsp; ↵</button>
            </div>
          </div>
        </div>
      </div>
      <div class="board-footer"><span>GROW SLOW. GO FAR.</span><span>● &nbsp; MADE FOR PLAY</span></div>
    </section>

    <aside class="side right">
      <div class="stat">
        <div class="stat-head"><span class="eyebrow">SESSION BEST</span><span class="stat-icon">♛</span></div>
        <div class="stat-value" id="best">0</div>
        <div class="stat-note">Your personal best</div>
      </div>
      <div class="guide">
        <div class="guide-title eyebrow">HOW TO PLAY</div>
        <div class="guide-row"><span>Move</span><span class="keys"><kbd>↑</kbd><kbd>←</kbd><kbd>↓</kbd><kbd>→</kbd></span></div>
        <div class="guide-row"><span>Or use</span><span class="keys"><kbd>W</kbd><kbd>A</kbd><kbd>S</kbd><kbd>D</kbd></span></div>
        <div class="guide-row"><span>Pause</span><span class="keys"><kbd>P</kbd></span></div>
        <div class="guide-row"><span>Restart</span><span class="keys"><kbd>SPACE</kbd></span></div>
      </div>
      <div class="tip">Collect the glowing fruit.<br>Don't run into yourself.</div>
    </aside>
  </main>
</div>
<script>
(() => {
  const canvas = document.getElementById('game');
  const ctx = canvas.getContext('2d');
  const scoreEl = document.getElementById('score');
  const bestEl = document.getElementById('best');
  const hint = document.getElementById('startHint');
  const modeText = document.getElementById('modeText');
  const cover = document.getElementById('cover');
  const coverTitle = document.getElementById('coverTitle');
  const coverText = document.getElementById('coverText');
  const coverButton = document.getElementById('coverButton');
  const N = 24, CELL = 30, STEP = 125;
  const dirs = [{x:1,y:0},{x:0,y:1},{x:-1,y:0},{x:0,y:-1}];
  let snake, previous, direction, queue, food, score, best = 0, particles = [];
  let state = 'demo', accumulator = 0, lastTime = 0, currentTime = 0;

  function reset() {
    snake = [{x:11,y:12},{x:10,y:12},{x:9,y:12},{x:8,y:12},{x:7,y:12}];
    previous = snake.map(p => ({...p}));
    direction = {x:1,y:0};
    queue = [];
    food = {x:15,y:12};
    score = 0;
    particles = [];
    accumulator = 0;
    updateScore();
  }
  function updateScore() {
    scoreEl.textContent = score;
    bestEl.textContent = best;
  }
  function spawnFood() {
    const empty = [];
    for (let y=0; y<N; y++) for (let x=0; x<N; x++) {
      if (!snake.some(s => s.x === x && s.y === y)) empty.push({x,y});
    }
    return empty.length ? empty[Math.floor(Math.random() * empty.length)] : null;
  }
  function start() {
    state = 'playing';
    reset();
    hint.style.display = 'none';
    cover.classList.remove('show');
    modeText.textContent = 'LIVE GAME';
  }
  function endGame() {
    if (state === 'demo') { reset(); return; }
    state = 'over';
    coverTitle.textContent = 'Game over';
    coverText.textContent = `You scored ${score} points. Nice run!`;
    coverButton.textContent = 'PLAY AGAIN  ↵';
    document.getElementById('coverIcon').textContent = '✳';
    cover.classList.add('show');
    modeText.textContent = 'GAME OVER';
  }
  function togglePause() {
    if (state === 'playing') {
      state = 'paused';
      coverTitle.textContent = 'Taking a breather?';
      coverText.textContent = 'Your game is paused.';
      coverButton.textContent = 'RESUME  P';
      document.getElementById('coverIcon').textContent = 'Ⅱ';
      cover.classList.add('show');
      modeText.textContent = 'PAUSED';
    } else if (state === 'paused') {
      state = 'playing';
      cover.classList.remove('show');
      modeText.textContent = 'LIVE GAME';
      accumulator = 0;
    }
  }
  function burst(x,y) {
    for (let i=0; i<16; i++) {
      const a = Math.random()*Math.PI*2, speed = 45+Math.random()*120;
      particles.push({x:(x+.5)*CELL,y:(y+.5)*CELL,vx:Math.cos(a)*speed,vy:Math.sin(a)*speed,
        life:.35+Math.random()*.4,max:.75,r:2+Math.random()*4, color:Math.random()>.45?'#d4f889':'#ffb779'});
    }
  }
  function aiDirection() {
    // Find a short route to the fruit, treating the moving tail as free.
    const blocked = new Set(snake.slice(0,-1).map(p => p.y*N+p.x));
    const head = snake[0], visited = new Set([head.y*N+head.x]);
    const search = [{x:head.x,y:head.y,first:null}];
    for (let i=0; i<search.length; i++) {
      const p = search[i];
      if (food && p.x===food.x && p.y===food.y && p.first) return p.first;
      for (const d of dirs) {
        if (!p.first && d.x === -direction.x && d.y === -direction.y) continue;
        const x=p.x+d.x, y=p.y+d.y, key=y*N+x;
        if (x<0||x>=N||y<0||y>=N||blocked.has(key)||visited.has(key)) continue;
        visited.add(key); search.push({x,y,first:p.first||d});
      }
    }
    // If there is no route, choose the move with the most reachable space.
    let choice = direction, largest = -1;
    for (const d of dirs) {
      if (d.x === -direction.x && d.y === -direction.y) continue;
      const x=head.x+d.x, y=head.y+d.y, key=y*N+x;
      if (x<0||x>=N||y<0||y>=N||blocked.has(key)) continue;
      const seen=new Set([key]), cells=[{x,y}];
      for(let i=0;i<cells.length;i++) for(const n of dirs) {
        const nx=cells[i].x+n.x, ny=cells[i].y+n.y, k=ny*N+nx;
        if(nx>=0&&nx<N&&ny>=0&&ny<N&&!blocked.has(k)&&!seen.has(k)) {
          seen.add(k); cells.push({x:nx,y:ny});
        }
      }
      if (seen.size>largest) { largest=seen.size; choice=d; }
    }
    return choice;
  }
  function tick() {
    if (state === 'demo') direction = aiDirection();
    else if (queue.length) direction = queue.shift();
    const head = {x:snake[0].x+direction.x, y:snake[0].y+direction.y};
    const eating = food && head.x===food.x && head.y===food.y;
    const body = eating ? snake : snake.slice(0,-1);
    if (head.x<0||head.x>=N||head.y<0||head.y>=N||body.some(p=>p.x===head.x&&p.y===head.y)) {
      endGame(); return;
    }
    previous = snake.map(p=>({...p}));
    snake.unshift(head);
    if (eating) {
      score += 10;
      if (state !== 'demo') best = Math.max(best, score);
      updateScore();
      burst(head.x,head.y);
      food = spawnFood();
      if (!food) endGame();
    } else snake.pop();
  }
  function roundedRect(x,y,w,h,r,fill) {
    ctx.fillStyle=fill;
    ctx.beginPath(); ctx.roundRect(x,y,w,h,r); ctx.fill();
  }
  function draw() {
    const size=N*CELL;
    ctx.clearRect(0,0,size,size);
    ctx.fillStyle='#101c15'; ctx.fillRect(0,0,size,size);
    // Subtle checkerboard and grid lend the field depth.
    for(let y=0;y<N;y++) for(let x=0;x<N;x++) {
      if ((x+y)%2===0) { ctx.fillStyle='#ffffff05'; ctx.fillRect(x*CELL,y*CELL,CELL,CELL); }
    }
    ctx.strokeStyle='#b7e0ac0b'; ctx.lineWidth=1;
    ctx.beginPath();
    for(let i=1;i<N;i++) { ctx.moveTo(i*CELL,0);ctx.lineTo(i*CELL,size);ctx.moveTo(0,i*CELL);ctx.lineTo(size,i*CELL); }
    ctx.stroke();

    if (food) {
      const x=(food.x+.5)*CELL, y=(food.y+.5)*CELL;
      const pulse=1+Math.sin(currentTime/240)*.07;
      const glow=ctx.createRadialGradient(x,y,2,x,y,27);
      glow.addColorStop(0,'#ffa35d77'); glow.addColorStop(1,'#ffa35d00');
      ctx.fillStyle=glow;ctx.beginPath();ctx.arc(x,y,27,0,Math.PI*2);ctx.fill();
      ctx.fillStyle='#ffad70';ctx.beginPath();ctx.arc(x,y,9*pulse,0,Math.PI*2);ctx.fill();
      ctx.fillStyle='#ffe1b6';ctx.beginPath();ctx.arc(x-3,y-3,2.5,0,Math.PI*2);ctx.fill();
      ctx.strokeStyle='#bce784';ctx.lineWidth=2.5;ctx.lineCap='round';
      ctx.beginPath();ctx.moveTo(x+1,y-9);ctx.quadraticCurveTo(x+3,y-15,x+8,y-15);ctx.stroke();
    }

    const alpha = (state==='playing'||state==='demo') ? Math.min(1,accumulator/STEP) : 1;
    const points=snake.map((s,i)=>{
      const old=previous[Math.min(i,previous.length-1)] || s;
      return {x:(old.x+(s.x-old.x)*alpha+.5)*CELL,y:(old.y+(s.y-old.y)*alpha+.5)*CELL};
    });
    ctx.lineCap='round';ctx.lineJoin='round';
    for(let i=points.length-1;i>0;i--) {
      const a=points[i], b=points[i-1];
      ctx.strokeStyle=i%2?'#7dc85c':'#8bd666';
      ctx.lineWidth=24;
      ctx.beginPath();ctx.moveTo(a.x,a.y);ctx.lineTo(b.x,b.y);ctx.stroke();
    }
    for(let i=points.length-1;i>0;i--) {
      const p=points[i];
      roundedRect(p.x-12,p.y-12,24,24,9,i%2?'#81ce5f':'#91dc6d');
      roundedRect(p.x-8,p.y-9,16,3,2,'#d4ffae24');
    }
    if(points.length) {
      const p=points[0];
      ctx.shadowColor='#a9f57b55';ctx.shadowBlur=13;
      roundedRect(p.x-13,p.y-13,26,26,9,'#b8ef7a');
      ctx.shadowBlur=0;
      const perp={x:-direction.y,y:direction.x};
      for(const side of [-1,1]) {
        const ex=p.x+direction.x*5+perp.x*5.5*side;
        const ey=p.y+direction.y*5+perp.y*5.5*side;
        ctx.fillStyle='#17301c';ctx.beginPath();ctx.arc(ex,ey,2.4,0,Math.PI*2);ctx.fill();
        ctx.fillStyle='#f1ffe4';ctx.beginPath();ctx.arc(ex-.6,ey-.8,.7,0,Math.PI*2);ctx.fill();
      }
    }
    for(const p of particles) {
      ctx.globalAlpha=Math.max(0,p.life/p.max);
      ctx.fillStyle=p.color;ctx.beginPath();ctx.arc(p.x,p.y,p.r,0,Math.PI*2);ctx.fill();
    }
    ctx.globalAlpha=1;
  }
  function frame(time) {
    if (!lastTime) lastTime=time;
    const dt=Math.min(50,time-lastTime); lastTime=time; currentTime=time;
    if (state==='demo'||state==='playing') {
      accumulator+=dt;
      while(accumulator>=STEP) { accumulator-=STEP; tick(); if(state==='over') break; }
      for(const p of particles) { p.x+=p.vx*dt/1000; p.y+=p.vy*dt/1000; p.vx*=.98; p.vy*=.98; p.life-=dt/1000; }
      particles=particles.filter(p=>p.life>0);
    }
    draw();
    requestAnimationFrame(frame);
  }
  const keyDirs={ArrowUp:{x:0,y:-1},w:{x:0,y:-1},ArrowDown:{x:0,y:1},s:{x:0,y:1},ArrowLeft:{x:-1,y:0},a:{x:-1,y:0},ArrowRight:{x:1,y:0},d:{x:1,y:0}};
  document.addEventListener('keydown', e => {
    const key=e.key.length===1?e.key.toLowerCase():e.key;
    if (keyDirs[key] || key===' ' || key==='Enter' || key==='p') e.preventDefault();
    if (state==='demo') {
      start();
      if (!keyDirs[key]) return;
    } else if (state==='over') {
      if (key===' '||key==='Enter') start();
      return;
    }
    if (key==='p') { togglePause(); return; }
    if (state!=='playing') return;
    const next=keyDirs[key];
    if (next) {
      const last=queue.length?queue[queue.length-1]:direction;
      if (!(next.x===-last.x && next.y===-last.y) && !(next.x===last.x && next.y===last.y) && queue.length<8) queue.push(next);
    }
  });
  canvas.addEventListener('click',()=>{ if(state==='demo') start(); });
  hint.addEventListener('click',start);
  coverButton.addEventListener('click',()=>{ if(state==='paused') togglePause(); else start(); });
  reset();
  requestAnimationFrame(frame);
})();
</script>
</body>
</html>
Reasoning trace (1,034 tokens)
**Designing an Arcade Game Layout**

I need to create an attractive demo for an arcade game with an autoplay background message. I’m thinking about a canvas board sized 24x24 and a full design screenshot of 1280x800. The dark premium arcade aesthetic should have the board centered on the page, with a header at the top and sidebar information. I need the layout to clearly show score cards, controls, and ensure the game employs safe movements with an AI path using a Hamiltonian cycle. This will make the gameplay experience smooth and engaging!**Developing Snake Game Mechanics**

For the snake game, I want to simulate the movement using a BFS path to the food while ensuring safety through area flooding. The snake follows a Hamiltonian cycle if food is far away. I’m setting the logic with the snake's initial cells and ensuring smooth movements via interpolation. The canvas should have subtle grid styling, while segment connections can be rounded. I’ll also add a glowing food effect and a floating message at the bottom to prompt users to start the game. That should create an engaging and visually appealing experience!**Implementing Game Controls and UI**

I need to set up initial self-play for the game and a call-to-action (CTA) with a canvas displaying a badge in the top left. The game should start with a click anywhere or after pressing a key, with "P" triggering the demo start. When the game is over, it should restart, and "P" can also pause the game. I’ll implement a keyboard queue for quick inputs while preventing any reverse turns. I want to ensure valid turns only, with restrictions on the opposite direction, giving a clear and responsive gameplay experience.**Considering mobile layout and canvas design**

I'm deciding where to place sidebars on a mobile layout, either above or below the game board. I want to use CSS grid areas to set up the layout, making sure the board comes first, followed by the score and title. For the canvas settings, I’m aiming for responsiveness with a width of 720 pixels and a scaled pixel ratio. I’m also working on drawing the game elements like the snake and food efficiently while considering pathfinding algorithms.**Resetting and implementing game mechanics**

I’m starting with an initial state reset for the game. The particles will update in real time, creating a burst effect. I need to make sure that when the demo runs, the snake eats within about 0.5 seconds and starts with four cells, while also updating the score. For the demo AI, I'll use BFS to aim for the food. If the snake gets trapped, it should reset automatically. I’ll also add an overlay message to prompt the user to start.