Snake · muse-spark-1.3
Output generated Cost / run $0.3196 Runtime 204.9s
Prompt for this run
Build a playable Snake game on a canvas with a 20 by 20 cell board. Use HTML, CSS, and JavaScript as needed. Write it to `index.html` in the current working directory using your file tools. Inline your own CSS and JavaScript. Do not use external assets, CDNs, or network requests. No third-party libraries are provided. Required behavior: - Use arrow keys to turn a snake that advances one cell at a time. Ignore a direction that would immediately reverse into its own neck, including rapid inputs before the next movement step. - Place one food item in an unoccupied cell. Eating it grows the snake by one segment, increases the score, and spawns new food in another unoccupied cell. - Use solid board boundaries: hitting a wall or the snake's body ends the game. Moving into a tail cell that vacates on that same non-growing step is allowed. - Provide Start, Pause/Resume, and Restart. Restart resets snake length, direction, score, food, and game state. Filling the board shows a win state instead of trying to place impossible food. - Display the controls and score. Prevent arrow keys from scrolling the page. Verify: Start the game and make a few turns to check grid-aligned movement and direction response. Pause and resume, then use Restart and check that snake length and score return to their initial values and food occupies a free cell.
TAKE IT TO CODE
A single self-contained HTML file — copy it and open in any browser, or reuse the prompt with your own pi-agent run.
RUN
METRICS
Transcript · 55 messages
Build a playable Snake game on a canvas with a 20 by 20 cell board. Use HTML, CSS, and JavaScript as needed. Write it to `index.html` in the current working directory using your file tools. Inline your own CSS and JavaScript. Do not use external assets, CDNs, or network requests. No third-party libraries are provided. Required behavior: - Use arrow keys to turn a snake that advances one cell at a time. Ignore a direction that would immediately reverse into its own neck, including rapid inputs before the next movement step. - Place one food item in an unoccupied cell. Eating it grows the snake by one segment, increases the score, and spawns new food in another unoccupied cell. - Use solid board boundaries: hitting a wall or the snake's body ends the game. Moving into a tail cell that vacates on that same non-growing step is allowed. - Provide Start, Pause/Resume, and Restart. Restart resets snake length, direction, score, food, and game state. Filling the board shows a win state instead of trying to place impossible food. - Display the controls and score. Prevent arrow keys from scrolling the page. Verify: Start the game and make a few turns to check grid-aligned movement and direction response. Pause and resume, then use Restart and check that snake length and score return to their initial values and food occupies a free cell.
thinking
Designing a single-file 20x20 snake game with canvas, input handling, state logic, and UI controls.Implementing input queueing with reverse-move filtering and game loop timing plus collision and growth logic.
Building your Snake game — 20×20 canvas, queued turns, and full game states.
index.html (13821 bytes)Successfully wrote to index.html
thinking
Game file written — now verifying it live in the browser.
{"action":"reload"}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"SNAKE 20×20\nEat · Grow · Don't hit the walls\nScore: 0\nLength: 3\nReady\nReady to play?\n\nPress Start or hit an arrow key to begin.\n\nStart\nStart\nPause\nRestart\nControls: ←↑↓→ or WASD to turn · Space pause/resume · R restart\nSolid walls kill. Tail-chasing into the vacating tail cell is safe.","images":"attached"}
thinking
Verifying game controls by clicking Start and testing turns, pause, resume, and restart with browser interaction tool.
Initial render looks right — now I'll run the gameplay checks.
{"action":"click","x":600,"y":419}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"SNAKE 20×20\nEat · Grow · Don't hit the walls\nScore: 0\nLength: 3\nRunning\nStart\nPause\nRestart\nControls: ←↑↓→ or WASD to turn · Space pause/resume · R restart\nSolid walls kill. Tail-chasing into the vacating tail cell is safe.","images":"attached"}
thinking
{"action":"key","text":"ArrowUp"}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"SNAKE 20×20\nEat · Grow · Don't hit the walls\nScore: 0\nLength: 3\nGame Over\nGame Over\n\nScore: 0 · Length: 3. Press Restart to play again.\n\nStart\nStart\nPause\nRestart\nControls: ←↑↓→ or WASD to turn · Space pause/resume · R restart\nSolid walls kill. Tail-chasing into the vacating tail cell is safe.","images":"attached"}
thinking
The snake hit the wall during the delay — that's the solid-boundary rule working. I'll restart and verify turning faster.
{"action":"click","x":698,"y":619}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"SNAKE 20×20\nEat · Grow · Don't hit the walls\nScore: 0\nLength: 3\nRunning\nStart\nPause\nRestart\nControls: ←↑↓→ or WASD to turn · Space pause/resume · R restart\nSolid walls kill. Tail-chasing into the vacating tail cell is safe.","images":"attached"}
thinking
Analyzing tool latency causing snake to hit wall before turn, weighing slower test speed against playable final speed and verifying pause and restart instead.
{"action":"key","text":"ArrowUp"}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"SNAKE 20×20\nEat · Grow · Don't hit the walls\nScore: 0\nLength: 3\nGame Over\nGame Over\n\nScore: 0 · Length: 3. Press Restart to play again.\n\nStart\nStart\nPause\nRestart\nControls: ←↑↓→ or WASD to turn · Space pause/resume · R restart\nSolid walls kill. Tail-chasing into the vacating tail cell is safe.","images":"attached"}
thinking
Adjusting game tick timing to reduce latency and ensure safe turn verification within snake survival steps.Raising the tick interval to 200ms to make manual verification feasible while keeping gameplay responsive.
The round-trip delay is killing the snake before I can steer — I'll slow the tick and give more runway, then re-check.
{"edits":[{"newText":" var TICK_MS = 200;","oldText":" var TICK_MS = 140;"},{"newText":" snake = [{x:6,y:10},{x:5,y:10},{x:4,y:10}];","Successfully replaced 2 block(s) in index.html.
{"action":"reload"}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"SNAKE 20×20\nEat · Grow · Don't hit the walls\nScore: 0\nLength: 3\nReady\nReady to play?\n\nPress Start or hit an arrow key to begin.\n\nStart\nStart\nPause\nRestart\nControls: ←↑↓→ or WASD to turn · Space pause/resume · R restart\nSolid walls kill. Tail-chasing into the vacating tail cell is safe.","images":"attached"}
thinking
{"action":"click","x":600,"y":419}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"SNAKE 20×20\nEat · Grow · Don't hit the walls\nScore: 0\nLength: 3\nRunning\nStart\nPause\nRestart\nControls: ←↑↓→ or WASD to turn · Space pause/resume · R restart\nSolid walls kill. Tail-chasing into the vacating tail cell is safe.","images":"attached"}
thinking
{"action":"key","text":"ArrowUp"}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"SNAKE 20×20\nEat · Grow · Don't hit the walls\nScore: 0\nLength: 3\nRunning\nStart\nPause\nRestart\nControls: ←↑↓→ or WASD to turn · Space pause/resume · R restart\nSolid walls kill. Tail-chasing into the vacating tail cell is safe.","images":"attached"}
thinking
Debugging why ArrowUp key input failed to change snake direction and considering event handling issues.
The turn may need a tick to show — I'll queue another direction to reveal the path.
{"action":"key","text":"ArrowLeft"}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"SNAKE 20×20\nEat · Grow · Don't hit the walls\nScore: 0\nLength: 3\nGame Over\nGame Over\n\nScore: 0 · Length: 3. Press Restart to play again.\n\nStart\nStart\nPause\nRestart\nControls: ←↑↓→ or WASD to turn · Space pause/resume · R restart\nSolid walls kill. Tail-chasing into the vacating tail cell is safe.","images":"attached"}
thinking
Turning confirmed — the snake went vertical and hit the top wall. Now checking pause, resume, and restart.
{"action":"click","x":698,"y":620}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"SNAKE 20×20\nEat · Grow · Don't hit the walls\nScore: 0\nLength: 3\nRunning\nStart\nPause\nRestart\nControls: ←↑↓→ or WASD to turn · Space pause/resume · R restart\nSolid walls kill. Tail-chasing into the vacating tail cell is safe.","images":"attached"}
thinking
Analyzing a screenshot discrepancy where the snake position suggests a prior game state despite a reported restart.Investigating a stale screenshot and input queue mismatch after the restart click.
Restart isn't repainting the board right away — fixing that, then continuing the checks.
{"limit":30,"offset":60,"path":"index.html"}button { cursor: pointer; border: 1px solid #334155; border-radius: 10px; background: #1e293b; color: #e2e8f0; font-size: 1rem; font-weight: 600; padding: 10px 20px; transition: background .15s, transform .05s; } button:hover { background: #334155; } button:active { transform: scale(.97); } button.primary { background: #16a34a; border-color: #16a34a; color: #fff; } button.primary:hover { background: #15803d; } button:disabled { opacity: .4; cursor: default; } .help { margin-top: 14px; max-width: 440px; text-align: center; color: #94a3b8; font-size: .88rem; line-height: 1.6; } kbd { display: inline-block; background: #1e293b; border: 1px solid #475569; border-bottom-width: 3px; border-radius: 6px; padding: 1px 8px; font-family: inherit; font-size: .85rem; color: #e2e8f0; margin: 0 2px; } .dpad { display: none; margin-top: 12px; gap: 6px; grid-template-columns: repeat(3, 54px); grid-template-rows: repeat(3, 44px); } .dpad button { padding: 0; font-size: 1.2rem; } @media (pointer: coarse) { .dpad { display: grid; } } </style> </head> <body> <h1>SNAKE <span>20×20</span></h1> <div class="subtitle">Eat · Grow · Don't hit the walls</div> <div class="hud"> <div class="pill">Score: <strong id="score">0</strong></div> [314 more lines in file. Use offset=90 to continue.]
{"edits":[{"newText":" placeFood();\n stopLoop();\n updateHud();\n draw();","oldText":" placeFood();\n stopLoop();\n upSuccessfully replaced 1 block(s) in index.html.
{"action":"reload"}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"SNAKE 20×20\nEat · Grow · Don't hit the walls\nScore: 0\nLength: 3\nReady\nReady to play?\n\nPress Start or hit an arrow key to begin.\n\nStart\nStart\nPause\nRestart\nControls: ←↑↓→ or WASD to turn · Space pause/resume · R restart\nSolid walls kill. Tail-chasing into the vacating tail cell is safe.","images":"attached"}
thinking
{"action":"click","x":600,"y":420}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"SNAKE 20×20\nEat · Grow · Don't hit the walls\nScore: 0\nLength: 3\nRunning\nStart\nPause\nRestart\nControls: ←↑↓→ or WASD to turn · Space pause/resume · R restart\nSolid walls kill. Tail-chasing into the vacating tail cell is safe.","images":"attached"}
thinking
{"action":"click","x":605,"y":620}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"SNAKE 20×20\nEat · Grow · Don't hit the walls\nScore: 0\nLength: 3\nGame Over\nGame Over\n\nScore: 0 · Length: 3. Press Restart to play again.\n\nStart\nStart\nPause\nRestart\nControls: ←↑↓→ or WASD to turn · Space pause/resume · R restart\nSolid walls kill. Tail-chasing into the vacating tail cell is safe.","images":"attached"}
thinking
Analyzing latency causing pause test failures and evaluating alternatives like double-click, slower speed, or keyboard input for verification.
Latency keeps killing the snake before Pause arrives — I'll temporarily slow the game to capture the pause check.
{"edits":[{"newText":" var TICK_MS = 500; // slowed for verification; final 200","oldText":" var TICK_MS = 200;"}],"path":"index.html"}Successfully replaced 1 block(s) in index.html.
{"action":"reload"}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"SNAKE 20×20\nEat · Grow · Don't hit the walls\nScore: 0\nLength: 3\nReady\nReady to play?\n\nPress Start or hit an arrow key to begin.\n\nStart\nStart\nPause\nRestart\nControls: ←↑↓→ or WASD to turn · Space pause/resume · R restart\nSolid walls kill. Tail-chasing into the vacating tail cell is safe.","images":"attached"}
{"action":"click","x":600,"y":419}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"SNAKE 20×20\nEat · Grow · Don't hit the walls\nScore: 0\nLength: 3\nRunning\nStart\nPause\nRestart\nControls: ←↑↓→ or WASD to turn · Space pause/resume · R restart\nSolid walls kill. Tail-chasing into the vacating tail cell is safe.","images":"attached"}
thinking
{"action":"click","x":605,"y":620}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"SNAKE 20×20\nEat · Grow · Don't hit the walls\nScore: 0\nLength: 3\nPaused\nPaused\n\nScore: 0 · Length: 3\n\nResume\nStart\nResume\nRestart\nControls: ←↑↓→ or WASD to turn · Space pause/resume · R restart\nSolid walls kill. Tail-chasing into the vacating tail cell is safe.","images":"attached"}
thinking
Pause works — now I'll confirm resume and restart.
{"action":"click","x":600,"y":447}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"SNAKE 20×20\nEat · Grow · Don't hit the walls\nScore: 0\nLength: 3\nRunning\nStart\nPause\nRestart\nControls: ←↑↓→ or WASD to turn · Space pause/resume · R restart\nSolid walls kill. Tail-chasing into the vacating tail cell is safe.","images":"attached"}
thinking
{"action":"click","x":698,"y":620}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"SNAKE 20×20\nEat · Grow · Don't hit the walls\nScore: 0\nLength: 3\nRunning\nStart\nPause\nRestart\nControls: ←↑↓→ or WASD to turn · Space pause/resume · R restart\nSolid walls kill. Tail-chasing into the vacating tail cell is safe.","images":"attached"}
thinking
All states verified — restoring final game speed.
{"edits":[{"newText":" var TICK_MS = 150;","oldText":" var TICK_MS = 500; // slowed for verification; final 200"}],"path":"index.html"}Successfully replaced 1 block(s) in index.html.
{"action":"reload"}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"SNAKE 20×20\nEat · Grow · Don't hit the walls\nScore: 0\nLength: 3\nReady\nReady to play?\n\nPress Start or hit an arrow key to begin.\n\nStart\nStart\nPause\nRestart\nControls: ←↑↓→ or WASD to turn · Space pause/resume · R restart\nSolid walls kill. Tail-chasing into the vacating tail cell is safe.","images":"attached"}
thinking
{"command":"ls -la index.html && grep -c \"20\" index.html"}-rw-r--r-- 1 node node 13861 Oct 9 06:50 index.html 11
thinking
Done — `index.html` contains a self-contained 20×20 Snake game (no external resources). **Implemented:** - Canvas 400×400, 20px cells, checkerboard, snake + food rendering, Score/Length HUD, status pill, Start/Pause-Resume/Restart buttons + overlay, controls help (`←↑↓→/WASD`, `Space`, `R`). - Queued turning with reverse-rejection against last queued dir (handles rapid inputs); `preventDefault` on arrows/space to stop scrolling. - Food on random free cell; eat → +1 length, +1 score, new free food; tail-vacating move allowed (collision excludes tail on non-growing steps); wall/body hit → Game Over; full board (400) → Win. **Actually checked in browser (screenshots + DOM, no console errors):** - Start → Running, grid-aligned horizontal movement. - ArrowUp turn → snake went vertical then hit top wall → Game Over (direction response verified). - Pause → Paused overlay + Resume button; Resume → Running again. - Restart → Score 0, Length 3, snake back to initial cells, new food in free cell. **Remaining unverified (time/latency limits):** - Eating/growth/score increment (food spawns randomly, couldn't steer onto it within tool round-trip latency), self-collision death, tail-chase safety, rapid opposite-input rejection, full-board Win state, and scroll-prevention under a scrollable page — all implemented in code by inspection but not exercised live.