Snake · ling-3.1-flash
Output generated Cost / run $0.0131 Runtime 225.3s
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 · 75 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.
/tmp/job-EZltmb/index.html (17114 bytes)Successfully wrote to /tmp/job-EZltmb/index.html
{"action":"reload"}{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nReady?\n\nUse the arrow keys to turn. Eat the food, grow, and avoid walls and your own body.\n\nStart\nPause\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nPress Start to play.","images":"model does not support images"}
thinking
Console only sandbox warning. Need test. We can inspect DOM via browser inspect. Need click start.
{"action":"click","x":490,"y":688}{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nReady?\n\nUse the arrow keys to turn. Eat the food, grow, and avoid walls and your own body.\n\nStart\nPause\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nPress Start to play.","images":"model does not support images"}
thinking
Click coordinates perhaps button not at guessed due viewport layout. Need inspect to get positions? browser action inspect maybe returns DOM with rect?
{"action":"inspect"}{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nReady?\n\nUse the arrow keys to turn. Eat the food, grow, and avoid walls and your own body.\n\nStart\nPause\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nPress Start to play.","images":"model does not support images"}
thinking
Could use bash with maybe browser? No custom. Need infer coordinates. Canvas likely centered. Viewport 1200x800. Main width min(640,100%), padding 20 => game width 600? body padding 20, main width 640 max? Wait .game width min(640px,100%), body padding 20, so content width 1160, main 640, centered x 280..920. game padding 18, inner 604. Header etc. Canvas square width 604? canvas-wrap width 100% = 604, aspect 1. Header ~? h1 1.35rem and scoreboard. Start button around y maybe 700? My click 490,688 should likely start button. But DOM unchanged maybe coordinates wrong or button disabled? Let's calculate more carefully. body padding 20; main top 20. main padding 18 -> content y 38. Header height maybe h1 font 21.6 line ~? plus score boxes. score-box padding 12 + label ~10 + value ~20 = 42. Header align center, likely height 42. y content header 38..80. margin-bottom 14 => canvas y 94. canvas height 604 => ends 698. controls margin-top 14 => y 712, button height ~42 => 754. Start button x: controls flex gap 10, each flex 1 1 150 within 604, widths ~194.6. first x 18? main content x 280+18=298; button center x 298+97=395. So click (395,733), not 490,688. Let's click.
{"action":"click","x":395,"y":733}{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nReady?\n\nUse the arrow keys to turn. Eat the food, grow, and avoid walls and your own body.\n\nStart\nPause\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nGame running — use the arrow keys to turn.","images":"model does not support images"}
thinking
DOM overlay text remains? status changed but overlay still visible? We called hideOverlay sets className "overlay" but DOM text content remains; browser DOM output includes all text even hidden. Fine. Need make turns. Use key action. Coordinates irrelevant. Send ArrowUp maybe.
{"action":"key","text":"ArrowUp"}{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nReady?\n\nUse the arrow keys to turn. Eat the food, grow, and avoid walls and your own body.\n\nStart\nPause\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nGame running — use the arrow keys to turn.","images":"model does not support images"}
thinking
Need wait for steps; browser action maybe no wait. Could use bash sleep? Browser state persists. Use browser key then maybe action inspect after some time? We need verify movement maybe screenshot unavailable. Could use JS via browser? No eval action. Could use bash with node? But page is in browser tool only. We can inspect DOM text not canvas state. Maybe use screenshot? model doesn't support images. Could use canvas pixel via browser? No JS execution tool. Could perhaps use bash to open? no. We can rely code. But need "run app and inspect initial output and console". Done. Need test pause/resume/restart via buttons and DOM. Pause button coordinates: controls y 712, buttons widths: start x 298..492.6 center 395; pause x 502.6..697.2 center 599.9; restart x 707.2..901.8 center 804.5. Click pause.
{"action":"click","x":600,"y":733}{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nGame Over\n\nThe snake hit a solid boundary. Final score: 0.\n\nStart\nPause\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nGame over. Press Restart to play again.","images":"model does not support images"}
thinking
Interesting game over by wall before pause. Why? We sent ArrowUp while running, then waited perhaps many steps; snake started x 8..6 y10 moving right. Up turn then moves up from y10, eventually wall after 10 steps. The tool call delay enough? likely. This verifies wall and direction response maybe. But we wanted pause/resume. Need restart then start and pause quickly. Click restart center (804,733).
{"action":"click","x":804,"y":733}{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nReady?\n\nUse the arrow keys to turn. Eat the food, grow, and avoid walls and your own body.\n\nStart\nPause\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nPress Start to play.","images":"model does not support images"}
thinking
Restart resets values, overlay. Good. Need start and pause quickly. Click start then pause maybe immediate.
{"action":"click","x":395,"y":733}{"action":"click","x":600,"y":733}{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nReady?\n\nUse the arrow keys to turn. Eat the food, grow, and avoid walls and your own body.\n\nStart\nPause\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nGame running — use the arrow keys to turn.","images":"model does not support images"}
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nPaused\n\nPress Space or Resume to continue.\n\nStart\nResume\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nPaused. Press Space or Resume to continue.","images":"model does not support images"}
thinking
Great. Resume.
{"action":"click","x":600,"y":733}{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nPaused\n\nPress Space or Resume to continue.\n\nStart\nPause\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nGame running — use the arrow keys to turn.","images":"model does not support images"}
thinking
Good. Need maybe test turns and eating? We can use key actions with delays perhaps each call has overhead ~? First ArrowUp caused game over likely because enough time between calls. We can test a few turns more controlled maybe restart, start, send ArrowUp then ArrowLeft quickly in same? Can't send multiple key in one action. Could use bash? Maybe browser tool key action triggers immediate. We can restart, start, key ArrowUp, then immediately key ArrowLeft; likely within <170ms? Tool calls sequential maybe ~100ms. Then inspect. But game might move. We can test direction response and grid movement indirectly via game over only. Better perhaps use key sequence and pause after short. But no need perhaps.
Potential issue in code: localStorage may throw in sandboxed iframe due sandbox allow-same-origin? It worked initial read? If localStorage unavailable, script would throw and page not run. It ran, so okay.
Need review code carefully for bugs. Let's analyze.
State reset: snake head at {x:8,y:10}, body x7,x6, direction right. occupiedSet all snake. food random unoccupied. Good.
queueDirection: compare pending or direction, ignore reverse and same. Requirement "Ignore a direction that would immediately reverse into its own neck, including rapid inputs before next movement step." This handles. But subtle: if current direction right, pending up, then key left before step: current=pending up, left not reverse of up, so accepted; next step direction becomes up, pending left. Then next step up, pending left. This is valid (no immediate reverse because first step up). If current right, pending left (ignored), then up accepted. Good. If current right, pending up, then down accepted (not reverse of up), after first step up then down would reverse into neck on next step! Wait scenario: direction right, pending up, then user presses down before next step. Our queue compares next (down) to current (up): not reverse, so pendingDirection=down. On next step, direction becomes up (snake moves up). pendingDirection remains down. On following step, queueDirection? At step start, direction = pendingDirection (down), and next head is head.y+? After first step, head at y-1, direction down => next head y (old head), which is neck (previous head) -> collision. This is a rapid input issue: pressing up then down quickly before two steps can cause immediate reverse into neck. Requirement says ignore a direction that would immediately reverse into its own neck, including rapid inputs before next movement step. Does this scenario count? At time of pressing down, current pending is up, and down is not reverse of up, but because up hasn't been applied yet, applying down as next-next direction means after up step, down reverses into neck. Many implementations ignore any direction that is opposite current *applied* direction, but if multiple inputs within same step, should perhaps only accept one per step or compare to direction (currently applied), not pending. Let's think requirement: "Ignore a direction that would immediately reverse into its own neck, including rapid inputs before the next movement step." If snake moving right and player presses up then down before next movement: At next step, if we process only last direction (down), that would immediately reverse into neck, so should ignore down. Our implementation sets pending down, causing reversal on second step (not immediately on next step, but after first pending step). Is that "immediately reverse into its own neck"? It reverses after the up step, yes. Need robust handling.
Common approach: maintain direction and nextDirection; on keydown, if new direction not opposite current direction (already committed), set nextDirection. But rapid up then down while moving right: first up accepted, second down compared to current right (not opposite) and accepted, leading same issue if both processed sequentially. Better: only allow one queued direction per step, or maintain a small input queue with validation against last queued direction and ensure no reversal after applying sequence? Let's derive.
We need handle inputs before next movement step. If multiple turns within one step, physically snake only moves one cell; multiple direction changes before step are ambiguous. Typical Snake ignores input if same/reverse relative to current direction, but if up then down quickly, down is reverse of up and should be ignored if pending up is considered. Our code does that if we compare to pending and also ensure not reverse of pending? Wait current=pending up, next down => reverses true, so should have ignored! I mistakenly said not reverse: up vector (0,-1), down (0,1), yes reverses. So our code ignores down. Good. Scenario okay. If pending up, then left accepted; after first step up, pending left, next step left. Fine. If pending left, then down? current left, down not reverse, accepted; after first step left, down next. Fine. If pending left, then right ignored. Good. So requirement handled.
But there is subtle if pending up, then left, then down before step: current after left is left, down not reverse, accepted. Sequence up, left, down: first step up, second left, third down. After second left, down is reverse? left to down is not reverse; valid. Good. If sequence up, left, right: current left, right reverse -> ignored. Good.
Another subtle: same direction pending ignored. Fine.
Movement collision: bodyKeys excludes tail on non-growing. But if snake length 1, tailVacates true and loop excludes i=0, so bodyKeys empty; moving into own current head? next head different cell due direction; no issue. On growing, excludes none. Good. OccupiedSet updated. Food placement uses occupiedSet after reset and after moves. Good.
Win condition: if snake.length >= CELL_COUNT after unshift, score++ etc, food null. But can snake length reach 400 only after eating 397 times from length 3. On final eating, occupiedSet size before unshift = 399? Actually snake length 399, occupiedSet size 399, food in one unoccupied cell. nextHead=food, eating true, unshift => length 400, occupiedSet size 400. win. Good. score increments. If food null impossible only if occupiedSet size CELL_COUNT but snake length maybe 400; already win. Fine.
Restart resets state idle, cancel loop. Start from idle calls reset again. Start from over/win calls reset. Start from paused returns? start() if state running return; if paused none of conditions, then sets state running without resetting and hide overlay. Is that okay? Start button disabled when paused, so not clickable. Enter when paused calls resume. Fine.
Pause button click toggle: when paused, resume. Good.
Key handling: preventDefault for arrows and space. Also maybe event.repeat? Holding arrow sends repeated keydown; queueDirection same direction ignored, fine. Holding opposite? ignored. Space repeat could toggle rapidly; perhaps should ignore event.repeat for space/enter to avoid pause/resume flicker. Not required but could improve. Add if (event.repeat && (key===" " || key==="Enter")) return after preventDefault. Also arrow repeat okay.
Canvas dimensions 600, CSS scales. image-rendering pixelated maybe not issue. Draw uses canvas width. Good.
Potential issue status and overlay text after restart: overlay visible with title Ready? and text; hidden overlay retains old text but when shown updated. Fine.
Potential issue best stored in localStorage; requirement doesn't mention best but okay. No external assets.
Need perhaps verify initial output and console: done. Need maybe use browser screenshot? It says model does not support images, so can't. We can inspect DOM. Could maybe use bash to run a headless browser? Not necessary. But task explicitly says "Run the application in the browser and inspect initial output and console. Use available browser tools for brief pass through representative checks... Fix clear problems... Save final file, then briefly report what checked and which behaviors remain unverified." We did. Need maybe test restart after game over and values. We did restart from initial and after game over? We restarted after game over (clicked restart) and DOM showed score 0 length 3. Yes. Food occupies free cell not directly visible in DOM. Could verify via code or maybe use canvas pixel? We can't read canvas. Could potentially add a data attribute or expose state for testing, but not needed. We can trust code. But maybe we can use browser tool's inspect to see canvas? no. Could use bash with node to parse? no DOM.
Could use JavaScript in browser via key? No. Maybe browser tool supports action "type" only. No eval. We can use screenshot but image unsupported. We can still report food placement unverified visually but code ensures.
Need maybe test eating and growth. Could try to manipulate game via keyboard to eat food, but food random and time. We can restart and start, then send keys maybe. But to verify required behavior, code review enough? The prompt says verify start, turns, pause/resume, restart. We did start, one turn (ArrowUp) led to wall after several steps, showing direction response and grid-aligned movement? It hit wall, not directly grid. Pause/resume and restart done. Maybe need "make a few turns" explicitly. We only sent one arrow. We can do a few turns with controlled sequence and pause before wall. Let's attempt. Restart, start, then send ArrowUp, ArrowLeft, ArrowDown maybe quickly. But each tool call may take > step time; still can pause. We can observe no game over maybe. Let's do restart, start, key up, key left, key down, pause. Need ensure not hit wall before pause. Starting head (8,10) moving right. After start, if delay before first key maybe one step to (9,10). ArrowUp pending, next step to (9,9). ArrowLeft pending, next step (8,9). ArrowDown? current pending left, down not reverse, accepted; next step (8,10) (old initial head? snake now [8,9,9,9? let's simulate]) no collision likely. Then pause. Could work. Let's do.{"action":"click","x":804,"y":733}{"action":"click","x":395,"y":733}{"action":"key","text":"ArrowUp"}{"action":"key","text":"ArrowLeft"}{"action":"key","text":"ArrowDown"}{"action":"click","x":600,"y":733}{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nReady?\n\nUse the arrow keys to turn. Eat the food, grow, and avoid walls and your own body.\n\nStart\nPause\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nPress Start to play.","images":"model does not support images"}
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nReady?\n\nUse the arrow keys to turn. Eat the food, grow, and avoid walls and your own body.\n\nStart\nPause\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nGame running — use the arrow keys to turn.","images":"model does not support images"}
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nReady?\n\nUse the arrow keys to turn. Eat the food, grow, and avoid walls and your own body.\n\nStart\nPause\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nGame running — use the arrow keys to turn.","images":"model does not support images"}
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nReady?\n\nUse the arrow keys to turn. Eat the food, grow, and avoid walls and your own body.\n\nStart\nPause\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nGame running — use the arrow keys to turn.","images":"model does not support images"}
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nReady?\n\nUse the arrow keys to turn. Eat the food, grow, and avoid walls and your own body.\n\nStart\nPause\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nGame running — use the arrow keys to turn.","images":"model does not support images"}
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nPaused\n\nPress Space or Resume to continue.\n\nStart\nResume\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nPaused. Press Space or Resume to continue.","images":"model does not support images"}
thinking
Sequence succeeded without game over, indicating turns accepted. Good. Need maybe inspect file final. Could read portions or bash wc. Use read to ensure no accidental issues.
{"limit":80,"offset":1,"path":"/tmp/job-EZltmb/index.html"}<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Snake — 20×20</title> <style> :root { --bg: #0f172a; --panel: #1e293b; --panel-border: #334155; --text: #e2e8f0; --muted: #94a3b8; --accent: #34d399; --accent-dark: #059669; --danger: #f87171; --food: #fb7185; --grid: #16213a; } * { box-sizing: border-box; } html, body { margin: 0; min-height: 100%; background: radial-gradient(circle at 50% 0%, #17203a 0%, var(--bg) 55%); color: var(--text); font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; } body { display: flex; align-items: center; justify-content: center; padding: 20px; } .game { width: min(640px, 100%); background: rgba(30, 41, 59, 0.9); border: 1px solid var(--panel-border); border-radius: 18px; box-shadow: 0 24px 70px rgba(0, 0, 0, 0.45); padding: 18px; backdrop-filter: blur(4px); } header { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 14px; } h1 { font-size: 1.35rem; margin: 0; letter-spacing: 0.04em; } .scoreboard { display: flex; gap: 10px; } .score-box { background: #0b1220; border: 1px solid var(--panel-border); border-radius: 10px; padding: 6px 12px; text-align: center; min-width: 82px; } .score-box .label { display: block; color: var(--muted); font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.12em; } .score-box .value { font-size: 1.25rem; font-weight: 800; color: var(--accent); font-variant-numeric: tabular-nums; } .canvas-wrap { [545 more lines in file. Use offset=81 to continue.]
thinking
Need maybe improve event.repeat and perhaps remove localStorage because sandbox? It worked. Could leave. But maybe in some sandboxed iframe localStorage access can throw SecurityError depending environment; here it worked. The artifact runs fully sandboxed with no network; localStorage may be permitted but not guaranteed. To be robust, wrap localStorage in try/catch. Since no external assets, best score optional. If localStorage throws, game fails. We should make robust with safe storage. Replace best initialization and save. Use functions loadBest/saveBest with try/catch. This is a clear improvement. Also event.repeat. Let's edit. Find lines.
{"limit":120,"offset":300,"path":"/tmp/job-EZltmb/index.html"}const x = Math.floor(Math.random() * COLS); const y = Math.floor(Math.random() * ROWS); candidate = { x, y }; } while (occupiedSet.has(cellKey(candidate))); return candidate; } function updateHud() { scoreEl.textContent = String(score); lengthEl.textContent = String(snake.length); bestEl.textContent = String(best); } function setStatus(text, kind = "") { statusEl.textContent = text; statusEl.className = "status-line " + kind; } function showOverlay(title, text, mode = "") { overlayTitle.textContent = title; overlayText.textContent = text; overlay.className = "overlay visible " + mode; } function hideOverlay() { overlay.className = "overlay"; } function updateButtons() { startBtn.disabled = state === "running"; pauseBtn.disabled = !(state === "running" || state === "paused"); pauseBtn.textContent = state === "paused" ? "Resume" : "Pause"; } function start() { if (state === "running") return; if (state === "idle" || state === "over" || state === "win") reset(); state = "running"; pendingDirection = null; lastStepAt = performance.now(); hideOverlay(); setStatus("Game running — use the arrow keys to turn.", "live"); updateButtons(); ensureLoop(); } function pause() { if (state !== "running") return; state = "paused"; setStatus("Paused. Press Space or Resume to continue.", ""); showOverlay("Paused", "Press Space or Resume to continue."); updateButtons(); } function resume() { if (state !== "paused") return; state = "running"; lastStepAt = performance.now(); hideOverlay(); setStatus("Game running — use the arrow keys to turn.", "live"); updateButtons(); ensureLoop(); } function togglePause() { if (state === "running") pause(); else if (state === "paused") resume(); } function gameOver(reason) { state = "over"; cancelAnimationFrame(rafId); rafId = null; if (score > best) { best = score; localStorage.setItem("snake-best", String(best)); } updateHud(); const message = reason === "wall" ? "The snake hit a solid boundary." : "The snake ran into its own body."; setStatus("Game over. Press Restart to play again.", "warn"); showOverlay("Game Over", message + " Final score: " + score + ".", "over"); updateButtons(); draw(); } function win() { state = "win"; cancelAnimationFrame(rafId); rafId = null; score += 1; // final filling segment also counts as food eaten if (score > best) { best = score; localStorage.setItem("snake-best", String(best)); } food = null; updateHud(); setStatus("You filled the board — you win!", "live"); showOverlay("You Win!", "The snake filled all 400 cells. Final score: " + score + ".", "win"); updateButtons(); draw(); } function restart() { cancelAnimationFrame(rafId); rafId = null; reset(); state = "idle"; pendingDirection = null; setStatus("Press Start to play."); showOverlay("Ready?", "Use the arrow keys to turn. Eat the food, grow, and avoid walls and your own body."); updateButtons(); draw(); } function queueDirection(next) { if (state !== "running") return; // Compare against the direction that will be used for the next step. This // correctly ignores rapid inputs that would reverse into the neck even if [206 more lines in file. Use offset=420 to continue.]
thinking
Let's edit storage.
{"edits":[{"newText":" let best = loadBest();","oldText":" let best = Number(localStorage.getItem(\"snake-best\") || 0);"},{"newText":" fSuccessfully replaced 4 block(s) in /tmp/job-EZltmb/index.html.
thinking
Wait edit inserted loadBest before cellKey but best declaration is before functions? Let's inspect around declarations to ensure function hoisting okay. loadBest function declaration hoisted, yes. Good. Add event.repeat. Find handleKey.
{"limit":80,"offset":520,"path":"/tmp/job-EZltmb/index.html"}lastStepAt = performance.now(); rafId = requestAnimationFrame(loop); } } function draw() { const w = canvas.width; const h = canvas.height; const cell = w / COLS; ctx.clearRect(0, 0, w, h); // Checkerboard background. for (let y = 0; y < ROWS; y++) { for (let x = 0; x < COLS; x++) { ctx.fillStyle = (x + y) % 2 === 0 ? "#141d33" : "#17223c"; ctx.fillRect(x * cell, y * cell, cell, cell); } } // Subtle board border. ctx.strokeStyle = "#2b3a5d"; ctx.lineWidth = 2; ctx.strokeRect(1, 1, w - 2, h - 2); if (food) { const fx = food.x * cell; const fy = food.y * cell; const pad = cell * 0.16; ctx.fillStyle = "#fb7185"; ctx.beginPath(); ctx.arc(fx + cell / 2, fy + cell / 2, cell / 2 - pad, 0, Math.PI * 2); ctx.fill(); ctx.fillStyle = "rgba(255,255,255,0.35)"; ctx.beginPath(); ctx.arc(fx + cell * 0.38, fy + cell * 0.38, cell * 0.11, 0, Math.PI * 2); ctx.fill(); } // Draw from tail to head so the head is on top. for (let i = snake.length - 1; i >= 0; i--) { const segment = snake[i]; const sx = segment.x * cell; const sy = segment.y * cell; const t = i / Math.max(1, snake.length - 1); const radius = i === 0 ? cell * 0.22 : cell * 0.16; ctx.fillStyle = i === 0 ? "#6ee7b7" : "rgb(" + (34 + Math.floor(20 * t)) + ", " + (197 + Math.floor(-20 * t)) + ", " + (94 + Math.floor(-10 * t)) + ")"; roundRect(sx + cell * 0.08, sy + cell * 0.08, cell * 0.84, cell * 0.84, radius); ctx.fill(); if (i === 0) { // Eyes show the current direction. const cx = sx + cell / 2; const cy = sy + cell / 2; const ex = direction.x * cell * 0.12; const ey = direction.y * cell * 0.12; ctx.fillStyle = "#052e1b"; ctx.beginPath(); ctx.arc(cx - direction.y * cell * 0.16 + ex, cy - direction.x * cell * 0.16 + ey, cell * 0.07, 0, Math.PI * 2); ctx.arc(cx + direction.y * cell * 0.16 + ex, cy + direction.x * cell * 0.16 + ey, cell * 0.07, 0, Math.PI * 2); ctx.fill(); } } } function roundRect(x, y, width, height, radius) { const r = Math.min(radius, width / 2, height / 2); ctx.beginPath(); ctx.moveTo(x + r, y); ctx.lineTo(x + width - r, y); ctx.arcTo(x + width, y, x + width, y + r, r); ctx.lineTo(x + width, y + height - r); ctx.arcTo(x + width, y + height, x + width - r, y + height, r); ctx.lineTo(x + r, y + height); ctx.arcTo(x, y + height, x, y + height - r, r); ctx.lineTo(x, y + r); ctx.arcTo(x, y, x + r, y, r); ctx.closePath(); [40 more lines in file. Use offset=600 to continue.]
{"limit":50,"offset":590,"path":"/tmp/job-EZltmb/index.html"}ctx.moveTo(x + r, y); ctx.lineTo(x + width - r, y); ctx.arcTo(x + width, y, x + width, y + r, r); ctx.lineTo(x + width, y + height - r); ctx.arcTo(x + width, y + height, x + width - r, y + height, r); ctx.lineTo(x + r, y + height); ctx.arcTo(x, y + height, x, y + height - r, r); ctx.lineTo(x, y + r); ctx.arcTo(x, y, x + r, y, r); ctx.closePath(); } function handleKey(event) { const key = event.key; if (key === " " || key === "ArrowUp" || key === "ArrowDown" || key === "ArrowLeft" || key === "ArrowRight") { event.preventDefault(); } if (key === " ") { if (state === "idle") start(); else togglePause(); return; } if (key === "Enter") { if (state === "running") return; if (state === "paused") resume(); else start(); return; } if (key === "p" || key === "P") { togglePause(); return; } const vector = keyToVector[key]; if (vector) queueDirection(vector); } startBtn.addEventListener("click", start); pauseBtn.addEventListener("click", togglePause); restartBtn.addEventListener("click", restart); window.addEventListener("keydown", handleKey); // Restart puts the game into a known initial state before anything is shown. restart(); })(); </script> </body> </html>
thinking
Edit repeat.
{"edits":[{"newText":" if ((key === \" \" || key === \"Enter\") && event.repeat) return;\n\n if (key === \" \") {","oldText":" if (Successfully replaced 1 block(s) in /tmp/job-EZltmb/index.html.
thinking
Need reload and retest after edits. Browser reload.
{"action":"reload"}{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing.","error: Unexpected token 'function'"],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nReady?\n\nUse the arrow keys to turn. Eat the food, grow, and avoid walls and your own body.\n\nStart\nPause\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nPress Start to play.","images":"model does not support images"}
thinking
Oops syntax error! Our insertion likely caused issue: inserted function before cellKey but maybe within object? Let's inspect around declaration.
{"limit":100,"offset":180,"path":"/tmp/job-EZltmb/index.html"}.status-line.warn { color: var(--danger); } </style> </head> <body> <main class="game" aria-label="Snake game"> <header> <h1>🐍 Snake</h1> <div class="scoreboard" aria-live="polite"> <div class="score-box"> <span class="label">Score</span> <span class="value" id="score">0</span> </div> <div class="score-box"> <span class="label">Length</span> <span class="value" id="length">3</span> </div> <div class="score-box"> <span class="label">Best</span> <span class="value" id="best">0</span> </div> </div> </header> <div class="canvas-wrap"> <canvas id="board" width="600" height="600" aria-label="20 by 20 snake board"></canvas> <div class="overlay visible" id="overlay"> <h2 id="overlayTitle">Ready?</h2> <p id="overlayText">Use the arrow keys to turn. Eat the food, grow, and avoid walls and your own body.</p> </div> </div> <div class="controls"> <button id="startBtn" type="button">Start</button> <button id="pauseBtn" type="button" class="secondary" disabled>Pause</button> <button id="restartBtn" type="button" class="secondary">Restart</button> </div> <p class="help"> <kbd>←</kbd> <kbd>↑</kbd> <kbd>↓</kbd> <kbd>→</kbd> turn • <kbd>Space</kbd> pause/resume • <kbd>Enter</kbd> start/restart </p> <div class="status-line" id="status">Press Start to play.</div> </main> <script> (() => { "use strict"; const COLS = 20; const ROWS = 20; const CELL_COUNT = COLS * ROWS; const START_LENGTH = 3; const INITIAL_STEP_MS = 170; const MIN_STEP_MS = 75; const SPEEDUP_PER_FOOD = 4; const canvas = document.getElementById("board"); const ctx = canvas.getContext("2d"); const scoreEl = document.getElementById("score"); const lengthEl = document.getElementById("length"); const bestEl = document.getElementById("best"); const overlay = document.getElementById("overlay"); const overlayTitle = document.getElementById("overlayTitle"); const overlayText = document.getElementById("overlayText"); const startBtn = document.getElementById("startBtn"); const pauseBtn = document.getElementById("pauseBtn"); const restartBtn = document.getElementById("restartBtn"); const statusEl = document.getElementById("status"); // The logical state is always a full snake array. The head is segment 0. let snake; let direction; let pendingDirection; let food; let score; let best = loadBest(); let state; // "idle" | "running" | "paused" | "over" | "win" let lastStepAt = 0; let rafId = null; let stepMs = INITIAL_STEP_MS; let occupiedSet = new Set(); bestEl.textContent = String(best); const keyToVector = { ArrowUp: { x: 0, y: -1 }, ArrowDown: { x: 0, y: 1 }, ArrowLeft: { x: -1, y: 0 }, ArrowRight: { x: 1, y: 0 }, }; function reset() { snake = []; for (let i = 0; i < START_LENGTH; i++) { snake.push({ x: 8 - i, y: 10 }); } direction = { x: 1, y: 0 }; pendingDirection = null; score = 0; stepMs = INITIAL_STEP_MS; [362 more lines in file. Use offset=280 to continue.]
{"limit":80,"offset":280,"path":"/tmp/job-EZltmb/index.html"}occupiedSet = new Set(snake.map(cellKey)); food = placeFood(); updateHud(); draw(); } function loadBest() { try { return Number(localStorage.getItem("snake-best") || 0); } catch (error) { return 0; } } function saveBest() { try { localStorage.setItem("snake-best", String(best)); } catch (error) { // Best-score persistence is optional; ignore storage restrictions. } } return cell.y * COLS + cell.x; } function inBounds(cell) { return cell.x >= 0 && cell.x < COLS && cell.y >= 0 && cell.y < ROWS; } function placeFood() { if (occupiedSet.size >= CELL_COUNT) return null; // Pick repeatedly until an unoccupied cell is found. With a full board the // caller checks first, so this cannot loop forever. let candidate; do { const x = Math.floor(Math.random() * COLS); const y = Math.floor(Math.random() * ROWS); candidate = { x, y }; } while (occupiedSet.has(cellKey(candidate))); return candidate; } function updateHud() { scoreEl.textContent = String(score); lengthEl.textContent = String(snake.length); bestEl.textContent = String(best); } function setStatus(text, kind = "") { statusEl.textContent = text; statusEl.className = "status-line " + kind; } function showOverlay(title, text, mode = "") { overlayTitle.textContent = title; overlayText.textContent = text; overlay.className = "overlay visible " + mode; } function hideOverlay() { overlay.className = "overlay"; } function updateButtons() { startBtn.disabled = state === "running"; pauseBtn.disabled = !(state === "running" || state === "paused"); pauseBtn.textContent = state === "paused" ? "Resume" : "Pause"; } function start() { if (state === "running") return; if (state === "idle" || state === "over" || state === "win") reset(); state = "running"; pendingDirection = null; lastStepAt = performance.now(); hideOverlay(); setStatus("Game running — use the arrow keys to turn.", "live"); updateButtons(); ensureLoop(); } [282 more lines in file. Use offset=360 to continue.]
thinking
Our edit removed `function cellKey(cell) {` line but left body. Need restore. Edit.{"edits":[{"newText":" function cellKey(cell) {\n return cell.y * COLS + cell.x;\n }","oldText":" return cell.y * COLS + cell.x;\n Successfully replaced 1 block(s) in /tmp/job-EZltmb/index.html.
thinking
This edit might match first occurrence? It says unique? Tool succeeded. Need ensure no duplicate. Read around.
{"limit":50,"offset":290,"path":"/tmp/job-EZltmb/index.html"}return 0; } } function saveBest() { try { localStorage.setItem("snake-best", String(best)); } catch (error) { // Best-score persistence is optional; ignore storage restrictions. } } function cellKey(cell) { return cell.y * COLS + cell.x; } function inBounds(cell) { return cell.x >= 0 && cell.x < COLS && cell.y >= 0 && cell.y < ROWS; } function placeFood() { if (occupiedSet.size >= CELL_COUNT) return null; // Pick repeatedly until an unoccupied cell is found. With a full board the // caller checks first, so this cannot loop forever. let candidate; do { const x = Math.floor(Math.random() * COLS); const y = Math.floor(Math.random() * ROWS); candidate = { x, y }; } while (occupiedSet.has(cellKey(candidate))); return candidate; } function updateHud() { scoreEl.textContent = String(score); lengthEl.textContent = String(snake.length); bestEl.textContent = String(best); } function setStatus(text, kind = "") { statusEl.textContent = text; statusEl.className = "status-line " + kind; } function showOverlay(title, text, mode = "") { overlayTitle.textContent = title; overlayText.textContent = text; overlay.className = "overlay visible " + mode; } function hideOverlay() { [303 more lines in file. Use offset=340 to continue.]
thinking
Need syntax check. Use node? We can extract script and node --check? Since HTML, maybe use node with jsdom unavailable. Could use bash grep or use `node -e` after extracting script via awk? We can use bash sed? Rules say use read instead of cat/sed, but bash allowed for commands; use python maybe to extract and compile. We can run `python3 -c` to parse script and `node --check` temp. Or simply reload browser. Let's reload.
{"action":"reload"}{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nReady?\n\nUse the arrow keys to turn. Eat the food, grow, and avoid walls and your own body.\n\nStart\nPause\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nPress Start to play.","images":"model does not support images"}
thinking
No console error. Good. Need retest after fix. Click start, maybe key, pause, resume, restart. We'll do concise.
{"action":"click","x":395,"y":733}{"action":"key","text":"ArrowUp"}{"action":"key","text":"ArrowLeft"}{"action":"click","x":600,"y":733}{"action":"click","x":600,"y":733}{"action":"click","x":804,"y":733}{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nReady?\n\nUse the arrow keys to turn. Eat the food, grow, and avoid walls and your own body.\n\nStart\nPause\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nGame running — use the arrow keys to turn.","images":"model does not support images"}
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nReady?\n\nUse the arrow keys to turn. Eat the food, grow, and avoid walls and your own body.\n\nStart\nPause\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nGame running — use the arrow keys to turn.","images":"model does not support images"}
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nReady?\n\nUse the arrow keys to turn. Eat the food, grow, and avoid walls and your own body.\n\nStart\nPause\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nGame running — use the arrow keys to turn.","images":"model does not support images"}
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nPaused\n\nPress Space or Resume to continue.\n\nStart\nResume\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nPaused. Press Space or Resume to continue.","images":"model does not support images"}
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nPaused\n\nPress Space or Resume to continue.\n\nStart\nPause\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nGame running — use the arrow keys to turn.","images":"model does not support images"}
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nReady?\n\nUse the arrow keys to turn. Eat the food, grow, and avoid walls and your own body.\n\nStart\nPause\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nPress Start to play.","images":"model does not support images"}
thinking
Great. Need maybe test wall again after fix? Could click start and wait? Not necessary but we should ensure gameOver still works after storage edit. We did earlier before storage edit; storage edit only saves. Could test quickly by start then ArrowUp until wall maybe tool delay. But not needed maybe. We want representative checks. Could test game over and restart values. Already did earlier. After edit, code same except storage. Fine. Need maybe syntax check with node to be certain. We can extract script using Python and node --check. Use bash command; allowed. We'll use python to extract between <script> and </script> into /tmp/snake.js then node --check. This doesn't modify index.
{"command":"python3 - <<'PY'\nfrom pathlib import Path\nhtml = Path('/tmp/job-EZltmb/index.html').read_text()\nstart = html.index('<script>'/bin/bash: line 1: python3: command not found node:internal/modules/cjs/loader:1520 throw err; ^ Error: Cannot find module '/tmp/snake-check.js' at node:internal/modules/cjs/loader:1517:15 at node:internal/main/check_syntax:33:20 { code: 'MODULE_NOT_FOUND', requireStack: [] } Node.js v24.18.0 Command exited with code 1
thinking
No python. Use node itself to extract.
{"command":"node - <<'NODE'\nconst fs = require('fs');\nconst html = fs.readFileSync('/tmp/job-EZltmb/index.html', 'utf8');\nconst start = hJS syntax OK
thinking
Good. Need maybe check no external resources. Grep for http, src, link.
{"command":"rg -n \"https?://|cdn|<link|src=\" /tmp/job-EZltmb/index.html || echo \"No external resource references\"","timeout":30}No external resource references
thinking
Need maybe inspect full code for any other issue. Let's read script entirely maybe 300 lines. We have most. Use read offset 180-480 etc. Already. Let's reason about win and score. Requirement "Eating it grows snake by one segment, increases score, and spawns new food in another unoccupied cell." Our win path when board full doesn't spawn food; but that's because no unoccupied cell and requirement says filling board shows win instead of trying to place impossible food. Good.
"Moving into a tail cell that vacates on that same non-growing step is allowed." Our collision excludes last segment on non-growing. Good.
"Ignore a direction that would immediately reverse into its own neck, including rapid inputs before the next movement step." Our queueDirection compares to pendingDirection or direction. Need verify with rapid inputs: Suppose running right, pending null. Press up (accepted pending up). Press down (current pending up, reverses => ignored). Press left (current pending up, not reverse => pending left). Good. Suppose press up, press left, press down (current pending left, not reverse => pending down). Sequence up then left then down valid. Suppose press up, press left, press right (reverse of left => ignored). Good. Suppose press up, press left, press up (same as pending? current left, up not same/reverse => pending up; sequence up,left,up valid). Good.
But what if direction right, pending up, press left (accepted), press up before step: current pending left, up not reverse => pending up. Sequence right -> up -> left -> up. Valid. Good.
Potential issue when state paused: queueDirection returns, so inputs during pause ignored. Good.
Step timing: requestAnimationFrame loop; when browser tab inactive, rAF stops, so game pauses effectively. Acceptable. When start called from idle, reset again, so food new. Start from over/win resets. Good.
Pause button disabled when idle/over/win, so only toggle running/paused. Start disabled running. Restart always enabled. Good.
Controls displayed. Score displayed. Length and best extra.
Prevent arrow keys scrolling: keydown preventDefault. Also space. Good.
Canvas board 20x20 cells: canvas 600x600, cell 30. Draw grid. Good.
Solid boundaries: inBounds. Body collision. Good.
Food in unoccupied cell: occupiedSet. Good.
One food item: one food variable. Good.
Restart resets snake length, direction, score, food, game state. reset does. Good.
Win state: overlay. Good.
Potential issue `best` load before DOM? bestEl set after DOM elements defined; script at end, fine.
Potential issue `roundRect` name may conflict with CanvasRenderingContext2D.roundRect? It's a function declaration in IIFE, fine.
Potential issue CSS `aspect-ratio` support; okay.
Potential issue `image-rendering: pixelated` with rounded shapes maybe not ideal but fine.
Potential issue overlay pointer-events when hidden none; when visible auto, covers canvas and buttons? Overlay only within canvas-wrap, so doesn't cover controls. Good.
Potential issue Start button when state paused disabled? updateButtons startBtn.disabled = state==="running"; so when paused start enabled. Clicking Start while paused calls start(): state paused not reset, sets running, lastStepAt now, hide overlay, status running, update buttons. That effectively resumes. Is that acceptable? Start button labeled Start; when paused maybe could act as resume. Not harmful. Requirement provide Start, Pause/Resume, Restart. Pause button resumes. Could make Start disabled when paused to avoid ambiguity, but not necessary. Maybe better: startBtn.disabled = state === "running" || state === "paused"; then Start only from idle/over/win. But if user presses Start while paused, maybe expected resume? Not specified. Current behavior okay. However updateButtons when paused: startBtn disabled false, pauseBtn enabled Resume. Fine.
Potential issue Enter key when paused resume, when idle/over/win start. Good.
Potential issue P key toggles even when idle/over/win; togglePause does nothing unless running/paused. Good.
Potential issue if user clicks Pause while running, then clicks Start, game resumes without resetting; maybe okay.
Potential issue game over reason body if snake runs into itself. Good.
Potential issue food spawn "another unoccupied cell" could spawn same cell as previous food? After eating, old food cell becomes occupied by new head, so cannot. Good.
Potential issue occupiedSet updated correctly when snake moves: unshift next, add; pop removed, delete. On eating, no pop, so tail remains. Good. On reset, set from snake. On win, occupiedSet full. Good.
Potential issue if game over occurs, occupiedSet not updated for attempted move; fine because state over and draw current snake.
Potential issue if win occurs, food null and occupiedSet full. Good.
Potential issue score speedup: not required, but okay. MIN 75ms.
Potential issue best score increments on win even though final food already counted; we add 1 for final segment. Actually each eating increments score, including final eating, so when snake length reaches 400, score already incremented in eating branch before win. Then win adds another 1, double-counting final food. Let's check: In step, eating true: score++; stepMs...; if snake.length >= CELL_COUNT { updateHud(); win(); return; } Then win does score += 1. So final food counted twice. Requirement just score increases per food; double count on win is a bug. Remove `score += 1;` in win. Comment says final filling segment also counts as food eaten, but it already did. Need fix. Good catch. Edit win to not increment.{"edits":[{"newText":" function win() {\n state = \"win\";\n cancelAnimationFrame(rafId);\n rafId = null;\n if (score > best) {Successfully replaced 1 block(s) in /tmp/job-EZltmb/index.html.
thinking
Need maybe update win text "filled all 400 cells" okay. Score final equals foods eaten. Good. Could also simplify bodyKeys using occupiedSet and tail. Current fine. Need maybe test win impossible without automation. Not required. Code correct. Potential issue speedup and requestAnimationFrame: lastStepAt=now each step, so interval approximately stepMs but drift? It sets lastStepAt=now rather than += stepMs, okay. Potential issue when paused, rAF loop stops because loop sees state not running and sets rafId null. resume ensureLoop. Good. Potential issue when game over inside loop, cancelAnimationFrame then loop continues? In loop, after step() if state not running, rafId=null. Good. Potential issue when step triggers win, cancelAnimationFrame inside win, then loop after step checks state==="running" false, sets rafId null. Good. Potential issue when step triggers gameOver, same. Potential issue when start called while rafId null but state running? start returns if running. Good. Potential issue when restart called while running, cancel loop. Good. Need reload after final edit and quick syntax.
{"action":"reload"}{"command":"node - <<'NODE'\nconst fs = require('fs');\nconst html = fs.readFileSync('/tmp/job-EZltmb/index.html', 'utf8');\nconst start = h{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"🐍 Snake\nSCORE\n0\nLENGTH\n3\nBEST\n0\nReady?\n\nUse the arrow keys to turn. Eat the food, grow, and avoid walls and your own body.\n\nStart\nPause\nRestart\n\n← ↑ ↓ → turn • Space pause/resume • Enter start/restart\n\nPress Start to play.","images":"model does not support images"}
JS syntax OK
thinking
Need final response concise, report checked and unverified. But before final, maybe ensure file present. Use bash ls.
{"command":"ls -l /tmp/job-EZltmb/index.html","timeout":30}-rw-r--r-- 1 node node 17365 Oct 15 04:24 /tmp/job-EZltmb/index.html
thinking
We should mention initial output, console warning only sandbox, no app errors after fix. Actually console warning from iframe sandbox appears each time; not app error. We fixed syntax error. Need mention checked: - Loaded page: initial score 0, length 3, best 0, ready overlay, controls. - Started, sent ArrowUp/ArrowLeft, status running, no console errors. - Paused (button/overlay changed to Paused, Resume), resumed. - Restart returned score 0, length 3, ready state. - Earlier a long run into wall produced Game Over, confirming boundary handling. - JS syntax check and no external refs. Unverified: - Food position/growth/win not directly observed because canvas pixel state not readable in browser tool and random food; logic reviewed. - Exact grid alignment visually not screenshot due image support unavailable; canvas math uses fixed cell size. Maybe mention arrow scrolling prevention not directly observable but keydown preventDefault implemented. Need ensure final answer doesn't overdo. The user asked build; we can say done. Include file path. No need code. Desired oververbosity 5. Let's craft.
Built the playable Snake game in `/tmp/job-EZltmb/index.html`. **Implemented** - 20×20 canvas board (600×600, 30px cells) - Arrow-key turning with reversal protection, including rapid inputs before the next step - Food spawning only in unoccupied cells, growth, score updates, and speed-up - Wall/body collision; tail-vacating moves are allowed - Start, Pause/Resume, Restart, win state when the board is filled - Score, length, best score, controls, status overlay, and arrow-key scroll prevention - Fully inline CSS/JS; no external assets or network requests **Checked in the browser** - Initial load: score `0`, length `3`, ready overlay, all controls present - Started, sent `ArrowUp` and `ArrowLeft`, and confirmed the game remained running and responsive - Pause changed the UI to **Paused/Resume**; resume returned it to running - Restart restored score `0`, length `3`, and the initial ready state - A long run into a wall produced **Game Over** - Extracted JS passed `node --check`; no external resource references found **Not directly verified** - Exact canvas pixel positions and food placement were not visually inspectable because screenshot/image output is unavailable in this browser tool; the rendering and spawn logic were reviewed and use fixed cell coordinates plus an occupied-cell set. - Growth and full-board win state were logic-verified but not exercised to completion manually.