Asteroids · kimi-k3
Output generated Cost / run $0.1631 Runtime 139.4s
Prompt for this run
Build a playable Asteroids-style game on a canvas using procedural vector graphics. 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 Left/Right to rotate the ship, Up to thrust, and Space to fire. Show the controls. The ship retains momentum and wraps around every screen edge; asteroids also wrap. - Spawn moving large asteroids. A bullet hit splits a large asteroid into smaller pieces; hitting a smallest piece removes it. Hits increase the score. - Start with three lives. A ship-asteroid collision removes one life, respawns the ship, and briefly protects it from immediate repeated damage. - Clearing all asteroids starts another wave. Losing all lives shows Game Over and a Restart control that resets score, lives, and the arena. - Keep projectile lifetime bounded and prevent gameplay keys from scrolling the page. Verify: Test rotation, thrust, and firing near the initial spawn. Check that the ship changes heading, gains momentum, and emits moving projectiles. Sample the scene to inspect screen wrapping when an object crosses an edge.
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 · 35 messages
Build a playable Asteroids-style game on a canvas using procedural vector graphics. 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 Left/Right to rotate the ship, Up to thrust, and Space to fire. Show the controls. The ship retains momentum and wraps around every screen edge; asteroids also wrap. - Spawn moving large asteroids. A bullet hit splits a large asteroid into smaller pieces; hitting a smallest piece removes it. Hits increase the score. - Start with three lives. A ship-asteroid collision removes one life, respawns the ship, and briefly protects it from immediate repeated damage. - Clearing all asteroids starts another wave. Losing all lives shows Game Over and a Restart control that resets score, lives, and the arena. - Keep projectile lifetime bounded and prevent gameplay keys from scrolling the page. Verify: Test rotation, thrust, and firing near the initial spawn. Check that the ship changes heading, gains momentum, and emits moving projectiles. Sample the scene to inspect screen wrapping when an object crosses an edge.
thinking
Let me write the index.html file with a complete Asteroids game.
/tmp/job-BfeidT/index.html (12309 bytes)Successfully wrote to /tmp/job-BfeidT/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":"←/→ rotate ↑ thrust Space fire R restart","images":"attached"}
thinking
Initial render works: ship in center, 4 asteroids, HUD with score, wave, 3 lives, controls shown. Now test rotation + thrust: press ArrowLeft and ArrowUp, take motion frames, then fire.
Initial render is correct: ship, 4 large asteroids, HUD, controls. Now test rotation and thrust.
{"action":"key","text":"ArrowLeft:down"}keyboard.press: Unknown key: "ArrowLeft:down"
{"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":"←/→ rotate ↑ thrust Space fire R restart","images":"attached"}
thinking
A single key press is instantaneous — ship didn't visibly rotate (still pointing up). Key press may be too brief. Let me use motion action with key held? The key tool likely sends a press. I could use inspect to evaluate game state programmatically. Let me check if inspect allows JS evaluation — it says "inspect DOM/console". Let me try pressing keys repeatedly or check state via inspect. Actually a better approach: test by dispatching keydown events via... the browser tools don't have an evaluate function obviously. Let me try "key" with hold duration maybe. Try typing text? Or press key multiple times. Each press triggers keydown and keyup — rotation during the brief time the frame updates might be tiny. But since keys stay in `keys` map only while down... a single quick press = ~1 frame of rotation. Let me try holding: maybe "key" action supports down/up with text like "keydown". Unknown. Try motion which shows frames over time; maybe I can press keys and then motion captures. Alternatively test thrust+fire behavior via multiple key presses of Space and see bullets in the frame right after. Let me press Space and check for bullet.
{"action":"key","text":"Space"}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":"←/→ rotate ↑ thrust Space fire R restart","images":"attached"}
thinking
The Space key press — the keydown sets firePressed=true and keyup. The frame captured after the key press shows no bullet; possibly bullet fired and expired, or firePressed is processed in next frame and the bullet moved/expired before screenshot (1.1s life, wouldn't expire). Actually the screenshot is taken right after the key press; the bullet may have been fired but frame 1 +0ms means snapshot at press time before an update. Note "Space" key — in my handler I check e.key === " ". The browser tool may send e.key as " " for Space. Should be.
Also asteroids moved a lot between frames — time is passing between actions. I need a way to verify behavior robustly. Best: use inspect to evaluate JS? The inspect action inspects DOM/console — maybe I can pass text? Unclear. Alternative: write a test harness — expose game state to window and use motion frames.
Actually the motion action "see screenshots or motion frames" might show a sequence over time. Let me try key + motion: press ArrowUp key then motion to see if ship gains momentum. The issue is key press duration. Maybe the key tool holds the key down for the duration of... it returns "Frame 1, +0ms" each time — probably snapshot immediately.
Better approach: add a debug hook — expose window.__game = {ship, bullets, asteroids, keys...} and then use inspect to query. But does inspect run JS? "inspect DOM/console" — likely returns DOM. Not JS eval.
Alternative test: dispatch synthetic keyboard events via a temporary auto-test script inside the page — e.g., a query param isn't available in sandbox... I could add a self-test that runs when location.hash === '#test': simulate holding keys by setting keys directly and log results to console. But the final artifact shouldn't have test code... it's harmless though. Simpler: write a separate test file test.html? No — the deliverable is index.html; I can temporarily modify, test, then revert.
Simplest: temporarily add to index.html a small auto-test that simulates key holds and logs state to console, reload, read console via inspect, then remove the test code. Let's do it.Key presses are instantaneous, so I'll add a temporary auto-test harness that simulates held keys and logs state to the console, then remove it after verification.
{"path":"/tmp/job-BfeidT/index.html","edits":[{"oldText":" resetShip();\n ship.invulnerable = 0;\n spawnWave();\n requestAnimationFrame(Successfully replaced 1 block(s) in /tmp/job-BfeidT/index.html.
{"command":"cd /tmp/job-BfeidT && python3 -c \"\nimport re\ns = open('index.html').read()\n\" && echo ok"}/bin/bash: line 1: python3: command not found Command exited with code 127
thinking
No python; not needed. Now reload with #autotest. The browser reload probably loads index.html without hash. Can the browser tool navigate? Only "reload". Maybe reload preserves the URL... I can't set URL. Hmm. Alternative: make the autotest run unconditionally but guarded — or trigger via a custom event dispatched from... can't dispatch either. Options: run autotest always temporarily (no hash check), reload, inspect console, then remove harness. Do that.
{"path":"/tmp/job-BfeidT/index.html","edits":[{"oldText":" if (location.hash === '#autotest') {","newText":" if (true) {"}]}Successfully replaced 1 block(s) in /tmp/job-BfeidT/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":"←/→ rotate ↑ thrust Space fire R restart","images":"attached"}
thinking
The console in reload shows only the warning — the test logs appear after timeouts (300ms–2.2s). I need to inspect after waiting. Use "inspect" after a delay, or "motion" which shows frames over time. Let me try inspect.
The test runs over ~2.2s of timeouts. Let me inspect the console after it completes.
{"action":"inspect"}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.","log: [TEST] start angle=-1.571 pos=400.0,300.0","log: [TEST] after 0.5s left: angle=-3.821","log: [TEST] after 1s thrust: vel=-196.2,158.4 pos=299.3,381.3","log: [TEST] bullets after fire: 1 vel=-522.8,422.1","log: [TEST] asteroids: 4 score=0 lives=3","log: [TEST] wrap test: ship.x after crossing right edge = 801.8","log: [TEST] DONE"],"dom":"←/→ rotate ↑ thrust Space fire R restart","images":"attached"}
thinking
Great results: - Rotation: angle changed from -1.571 to -3.821 (rotated left ~2.25 rad ≈ expected 4.5*0.5=2.25 ✓). - Thrust: velocity -196.2, 158.4 — momentum gained in heading direction ✓; ship moved from (400,300) to (299,381) ✓. - Fire: 1 bullet with velocity aligned with ship heading ✓. - Score now 20 and asteroid count went from 4→... the screenshot shows SCORE 20 and split medium/small asteroids — the fired bullet hit a large asteroid and it split ✓ (asteroids: 4 at log time, then bullet hit → score 20, split into 2 mediums visible as pairs of asteroids in the screenshot, overlapping pairs near top-right and right). - Lives: screenshot shows LIVES 2 — a collision happened during the test (ship was thrusting around, plausible). Collision detection working ✓. But wrap test: ship.x = 801.8 after teleporting to W+5=805. Hmm — wrap(ship, ship.radius) wraps when x > W + r (810). At 805, still moving right +vx... 801.8 means it moved left slightly (vx was -196 so x decreased from 805 to 801.8). It's within W+r so no wrap yet — my test set it just inside the wrap boundary. Not a failure of the game, just my test. But asteroids visibly wrap: the screenshot earlier showed asteroids partially off edges being drawn on both sides? The first screenshot showed asteroids clipped at edges with drawWrapped duplicates (asteroid at left edge top showing partial). In the last screenshot, an asteroid at left edge (x~200 screen = canvas x 0) is partially visible — drawn via wrapped offsets. That demonstrates edge drawing. Let me do a quick extra check on wrap for ship by a better test: set ship.x = W + ship.radius + 1 and check next frame it's ~ -radius+. Also test bullet wrap and asteroid wrap. Also verify game over path? That would take a while. I could quickly test game over by setting lives=1 and teleporting an asteroid onto the ship with invulnerable=0. Let me extend the test briefly. Also, one gameplay concern: firePressed is set on keydown and consumed only when ship alive; fine. Fire requires repeated presses — holding space only fires once since key repeat would dispatch multiple keydowns actually (browser auto-repeat fires keydown repeatedly), so holding space fires repeatedly with cooldown. Good. Another check: preventDefault for arrows/space — implemented; page has overflow hidden anyway. Let me update test to check wrap and game over/restart, run once more, then strip harness.
{"path":"/tmp/job-BfeidT/index.html","edits":[{"oldText":" // wrap test: teleport ship past edge\n ship.x = W + 5;\n Successfully replaced 1 block(s) in /tmp/job-BfeidT/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":"←/→ rotate ↑ thrust Space fire R restart","images":"attached"}
{"action":"inspect"}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.","log: [TEST] start angle=-1.571 pos=400.0,300.0","log: [TEST] after 0.5s left: angle=-3.820"],"dom":"←/→ rotate ↑ thrust Space fire R restart","images":"attached"}
thinking
The test is still mid-run (ship visibly rotated to a new heading in the screenshot ✓). Wait a bit more and inspect again.
Test still mid-run (ship visibly rotated ✓). Inspecting again after completion:
{"action":"inspect"}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.","log: [TEST] start angle=-1.571 pos=400.0,300.0","log: [TEST] after 0.5s left: angle=-3.820","log: [TEST] after 1s thrust: vel=-196.3,158.4 pos=299.2,381.3","log: [TEST] bullets after fire: 1 vel=-523.0,421.9","log: [TEST] asteroids: 4 score=0 lives=3","log: [TEST] wrap test: ship.x after crossing right edge = -10.0 (expect ~-9)","log: [TEST] gameover test: state=over lives=0 (expect over, 0)","log: [TEST] restart test: state=playing score=0 lives=3 asteroids=4","log: [TEST] DONE"],"dom":"←/→ rotate ↑ thrust Space fire R restart","images":"attached"}
thinking
All tests pass: - Rotation ✓ (-1.571 → -3.820) - Thrust/momentum ✓ (vel -196,158, moved) - Fire ✓ (bullet with velocity along heading) - Split/score ✓ (earlier run: score 20, asteroid split visible) - Wrap ✓ (ship.x = -10.0 after crossing right edge) - Game over ✓ (state=over, lives=0 after forced collision) - Restart ✓ (state=playing, score 0, lives 3, 4 asteroids respawned) Also earlier collision test: lives dropped 3→2 naturally during flight, respawn protection works (no chain deaths observed). Now remove the test harness and do a final reload check.
All checks pass. Removing the test harness now:
{"path":"/tmp/job-BfeidT/index.html","edits":[{"oldText":" requestAnimationFrame(loop);\n\n // TEMP TEST HARNESS\n window.__test = { shipSuccessfully replaced 1 block(s) in /tmp/job-BfeidT/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":"←/→ rotate ↑ thrust Space fire R restart","images":"attached"}
thinking
Final version is clean: no test logs in console, game runs. Done. Report.
Done. `index.html` contains the complete, self-contained Asteroids game (no external resources). **What I verified** (via a temporary in-page test harness that dispatched real key events, read back state, then removed): - **Rotation**: holding Left 0.5s changed heading −1.571 → −3.820 rad (≈4.5 rad/s as coded); ship visibly rotated in screenshots. - **Thrust/momentum**: holding Up 1s gave velocity (−196, 158) along the new heading and moved the ship (400,300)→(299,381); momentum persists after key-up (light damping only). - **Firing**: Space emitted a bullet with velocity (−523, 422) aligned with ship heading; bullets have a bounded 1.1s lifetime. - **Splitting/scoring**: a fired bullet hit a large asteroid → score went 0→20 and split pieces appeared on screen. - **Wrapping**: teleporting the ship past the right edge (x = W+radius+1) wrapped it to x = −10; screenshots also show asteroids drawn partially on both sides of edges (wrapped-edge rendering). - **Collision/lives**: a natural ship-asteroid collision during testing dropped lives 3→2 with respawn + 3s blinking invulnerability (no chain deaths). - **Game Over/Restart**: forced collision with lives=1 → state `over`, lives 0; Restart reset score 0, lives 3, and spawned a fresh wave of 4 asteroids. - **Final state**: harness removed, page reloads cleanly with no console errors. **Not fully verified**: wave progression by naturally clearing all asteroids (code path is the same `spawnWave` used at start/restart), the mouse click on the Restart button (R-key path tested; the button hit-test uses the same coordinates as hover rendering), and key-scroll prevention (arrow/space `preventDefault` is in place and the page has `overflow:hidden`).