Asteroids · muse-spark-1.3
Output generated Cost / run $0.1464 Runtime 102.9s
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 · 23 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
Designing a single-file responsive canvas Asteroids game with ship controls, momentum, asteroid splitting, scoring, lives, invincibility, waves, and restart.Adding procedural vector rendering, input handling, wrapping, and collision for ship, asteroids, and bullets.
Building your Asteroids arena — vector ship, splitting rocks, and full game flow.
index.html (16379 bytes)Successfully wrote to index.html
thinking
Game file written — now verifying play controls and edge wrapping in the browser.
{"action":"reload"}Frame 1, +1ms
[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.","warning: The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://developer.chrome.com/blog/autoplay/#web_audio"],"dom":"◤ ASTEROIDS ◢\nPROCEDURAL VECTOR GRAPHICS • CANVAS\nSCORE 0\nWAVE 1\nLIVES\nWave 1 — good hunting!\n◀ ▶ rotate • ▲ thrust • SPACE fire • P pause • M mute\nLarge rock = 20 • Medium = 50 • Small = 100 | Clear the field to warp to the next wave. You get 3 lives + brief shield after respawn.\nPause (P)\nReset game","images":"attached"}
thinking
Analyzing ship invisibility during invulnerability blink and weighing reduced blink duty versus always-visible shield ring.
Initial render looks good — now I'll check rotation, thrust, firing, and wrapping.
{"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.","warning: The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://developer.chrome.com/blog/autoplay/#web_audio"],"dom":"◤ ASTEROIDS ◢\nPROCEDURAL VECTOR GRAPHICS • CANVAS\nSCORE 0\nWAVE 1\nLIVES\n◀ ▶ rotate • ▲ thrust • SPACE fire • P pause • M mute\nLarge rock = 20 • Medium = 50 • Small = 100 | Clear the field to warp to the next wave. You get 3 lives + brief shield after respawn.\nPause (P)\nReset game\n60 fps","images":"attached"}
thinking
Evaluating key press duration and motion testing to verify heading and thrust effects.
Ship and asteroids are rendering. Testing firing and motion next.
{"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.","warning: The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://developer.chrome.com/blog/autoplay/#web_audio"],"dom":"◤ ASTEROIDS ◢\nPROCEDURAL VECTOR GRAPHICS • CANVAS\nSCORE 0\nWAVE 1\nLIVES\n◀ ▶ rotate • ▲ thrust • SPACE fire • P pause • M mute\nLarge rock = 20 • Medium = 50 • Small = 100 | Clear the field to warp to the next wave. You get 3 lives + brief shield after respawn.\nPause (P)\nReset game\n60 fps","images":"attached"}
thinking
Debugging why bullet isn't visible by checking canvas focus, key event code, and cooldown or pause state.Switching firing to keydown to catch sub-frame taps and noting testability limits for held keys.
A quick tap isn't registering as a hold — I'll make inputs more responsive so rotation, thrust, and fire each respond to single presses too.
{"edits":[{"newText":" keys[e.code] = true;\n // immediate tap response (also polled held-state in update loop)\n if (ship && state==='plSuccessfully replaced 1 block(s) in index.html.
thinking
{"action":"reload"}Frame 1, +1ms
[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.","warning: The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://developer.chrome.com/blog/autoplay/#web_audio"],"dom":"◤ ASTEROIDS ◢\nPROCEDURAL VECTOR GRAPHICS • CANVAS\nSCORE 0\nWAVE 1\nLIVES\nWave 1 — good hunting!\n◀ ▶ rotate • ▲ thrust • SPACE fire • P pause • M mute\nLarge rock = 20 • Medium = 50 • Small = 100 | Clear the field to warp to the next wave. You get 3 lives + brief shield after respawn.\nPause (P)\nReset game","images":"attached"}
thinking
{"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.","warning: The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://developer.chrome.com/blog/autoplay/#web_audio"],"dom":"◤ ASTEROIDS ◢\nPROCEDURAL VECTOR GRAPHICS • CANVAS\nSCORE 0\nWAVE 1\nLIVES\n◀ ▶ rotate • ▲ thrust • SPACE fire • P pause • M mute\nLarge rock = 20 • Medium = 50 • Small = 100 | Clear the field to warp to the next wave. You get 3 lives + brief shield after respawn.\nPause (P)\nReset game\n60 fps","images":"attached"}
thinking
Rotation confirmed — heading shifted from 270° to 262°. Now checking thrust and firing.
{"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.","warning: The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://developer.chrome.com/blog/autoplay/#web_audio"],"dom":"◤ ASTEROIDS ◢\nPROCEDURAL VECTOR GRAPHICS • CANVAS\nSCORE 0\nWAVE 1\nLIVES\n◀ ▶ rotate • ▲ thrust • SPACE fire • P pause • M mute\nLarge rock = 20 • Medium = 50 • Small = 100 | Clear the field to warp to the next wave. You get 3 lives + brief shield after respawn.\nPause (P)\nReset game\n60 fps","images":"attached"}
thinking
Thrust confirmed — speed is now 28. Checking projectiles next.
{"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.","warning: The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://developer.chrome.com/blog/autoplay/#web_audio"],"dom":"◤ ASTEROIDS ◢\nPROCEDURAL VECTOR GRAPHICS • CANVAS\nSCORE 0\nWAVE 1\nLIVES\n◀ ▶ rotate • ▲ thrust • SPACE fire • P pause • M mute\nLarge rock = 20 • Medium = 50 • Small = 100 | Clear the field to warp to the next wave. You get 3 lives + brief shield after respawn.\nPause (P)\nReset game\n59 fps","images":"attached"}
thinking
Firing confirmed — projectile visible with BUL 1. Sampling motion to verify movement and wrapping.
{"action":"motion"}Frame 1, +0ms
[Browser image supplied to model]
Frame 2, +607ms
[Browser image supplied to model]
Frame 3, +1175ms
[Browser image supplied to model]
Frame 4, +1759ms
[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.","warning: The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://developer.chrome.com/blog/autoplay/#web_audio"],"dom":"◤ ASTEROIDS ◢\nPROCEDURAL VECTOR GRAPHICS • CANVAS\nSCORE 20\nWAVE 1\nLIVES\n◀ ▶ rotate • ▲ thrust • SPACE fire • P pause • M mute\nLarge rock = 20 • Medium = 50 • Small = 100 | Clear the field to warp to the next wave. You get 3 lives + brief shield after respawn.\nPause (P)\nReset game\n60 fps","images":"attached"}
thinking
All core checks passed. `index.html` is saved and playable. **Verified in-browser:** - **Rotation:** tapped `ArrowLeft` → HUD heading 270°→262°, ship nose visibly tilted. - **Thrust/momentum:** tapped `ArrowUp` → speed 0→28, ship drifts with retained velocity (SPD 22 in later frames). - **Firing/splitting:** tapped `Space` → yellow projectile visible (`BUL 1`); motion frames show `SCORE 20`, `AST 5` — a large rock split into 2 medium pieces. - **Wrapping:** asteroids seen half-clipped at left/right/bottom edges in successive frames, continuing motion without sticking (ship + asteroids both use edge wrap). - No console errors (only sandbox/AudioContext autoplay warnings). **Remains unverified (time-boxed):** full ship-death → 3-lives → Game Over → Restart flow, and multi-wave clear; code implements life loss + 3s shield, wave increment, and restart button resetting score/lives/arena, plus bounded bullet life (1.1s) and `preventDefault` on arrows/space.