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Dangerous Dave platformer · gpt-6.1-terra

Output generated Cost / run $0.0692 Runtime 125.8s

Prompt for this run

Build a playable tile-based platformer on a canvas in a Dangerous Dave-inspired style. 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: - Provide one completable level with solid platforms, a trophy, an exit, fire and water hazards, and at least one patrolling enemy. Draw everything procedurally. - Use Left/Right or A/D to move and Space to jump. Display the controls. Apply gravity, landing, and solid-wall collision; jumping is allowed only while grounded. - The player must collect the trophy before the exit completes the level. Reaching the exit without it gives visible feedback and keeps the level active. - Touching a hazard or enemy causes a loss state. Reaching the exit with the trophy causes a win state. - Provide Restart after either outcome and during play. Restart restores the level, trophy, enemies, and player position. Keep the level's route physically reachable. Verify: Test movement and a jump near the starting area. Check that the player lands on a nearby solid surface and that the trophy and exit are visibly identifiable. Use Restart and check that the initial player and collectible state return.

⛨ sandboxed Open in new tab ↗

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

modelgpt-6.1-terra
vendorOpenAI
harnesspi 0.87.1 · browser iteration
generated2026-10-26

METRICS

runtime125.8s
tokens in172k
tokens out7.8k
cached97k
cost / run$0.0692
Transcript · 29 messages
system

user

Build a playable tile-based platformer on a canvas in a Dangerous Dave-inspired style. 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: - Provide one completable level with solid platforms, a trophy, an exit, fire and water hazards, and at least one patrolling enemy. Draw everything procedurally. - Use Left/Right or A/D to move and Space to jump. Display the controls. Apply gravity, landing, and solid-wall collision; jumping is allowed only while grounded. - The player must collect the trophy before the exit completes the level. Reaching the exit without it gives visible feedback and keeps the level active. - Touching a hazard or enemy causes a loss state. Reaching the exit with the trophy causes a win state. - Provide Restart after either outcome and during play. Restart restores the level, trophy, enemies, and player position. Keep the level's route physically reachable. Verify: Test movement and a jump near the starting area. Check that the player lands on a nearby solid surface and that the trophy and exit are visibly identifiable. Use Restart and check that the initial player and collectible state return.

assistant
thinking
**Planning level design**

I need to implement and test a browser for my game. I envision a level with a route that's reachable, possibly using a 960x576 canvas and a 30x18 grid. The world design includes a floor at y=15 for hazards like gaps, water at specific tiles, and trophies placed on platforms. I want it to be straightforward with accessible tiers and hazards at different heights. I'll also calculate jump height and distance using speed and gravity. Let's make this fun!**Designing platform layout**

I’m starting the design with a platform at x=64. The row 12 platform is at y=384, and I'm placing a trophy on the x16 platform at y=224. The progression allows players to jump across various platforms at row 12, row 10 with a gap, and row 8. I'll also add hazards like water at row 14. The exit needs clear feedback, and I want smooth player movement across platforms. Plus, I'm considering the overall UI layout while keeping everything polished and visually appealing. The goal is a well-structured canvas!**Implementing visual aesthetics**

I’m focusing on creating a dark retro aesthetic for my project. It's important to inspect what that really means visually and how it translates into my design. I want to ensure that the atmosphere captures the essence of retro while maintaining a dark, engaging feel. It's all about the right color palette, textures, and overall vibe. I’ll implement this style to see how it enhances the user experience. Let's make it visually appealing!
→ write index.html (13155 bytes)
toolResult

Successfully wrote to index.html

assistant
thinking
→ browser {"action":"reload","x":0,"y":0,"toX":0,"toY":0,"text":"","delta":0}
toolResult
 
Frame 1, +0ms
[Browser image supplied to model]
{"console":[],"dom":"◆\nAN ARCADE ADVENTURE\nDANGER RUN\nA LITTLE DANGER. A LOT OF GLORY.\n01   /   THE GILDED EXIT\nREADY TO EXPLORE\nEXPEDITION 01   THE OLD RUINS\nTROPHY: NOT FOUND\n// THE MISSION\nFortune favors\nthe brave.\n\nMake your way through the ruins, claim the golden trophy, and find the way out.\n\n♛\nOBJECTIVE 01\nCollect the trophy\n▣\nOBJECTIVE 02\nReach the exit alive\n// HOW TO PLAY\nMove\n←\n→\nor\nA\nD\nJump\nSPACE\n\nWatch your step. Fire, water and wandering creatures are all bad news.\n\n↻   RESTART LEVEL\nA fresh start is always an option.\nBUILT FOR THE BOLD   /   EST. 1984\nGOOD LUCK, ADVENTURER.","images":"attached"}
assistant
 
thinking
**Exploring key interface movements**

I’m trying to figure out the browser key interface for testing movements. I’m not entirely clear on which key sends the press. It might be helpful to use the inspect tool to pinpoint this. I could look for text like "ArrowRight" to confirm which key is being activated. There seems to be a bit of uncertainty, so this exploration will help clarify things for me!
→ browser {"action":"key","x":0,"y":0,"toX":0,"toY":0,"text":"ArrowRight","delta":0}
toolResult
 
Frame 1, +0ms
[Browser image supplied to model]
{"console":[],"dom":"◆\nAN ARCADE ADVENTURE\nDANGER RUN\nA LITTLE DANGER. A LOT OF GLORY.\n01   /   THE GILDED EXIT\nREADY TO EXPLORE\nEXPEDITION 01   THE OLD RUINS\nTROPHY: NOT FOUND\n// THE MISSION\nFortune favors\nthe brave.\n\nMake your way through the ruins, claim the golden trophy, and find the way out.\n\n♛\nOBJECTIVE 01\nCollect the trophy\n▣\nOBJECTIVE 02\nReach the exit alive\n// HOW TO PLAY\nMove\n←\n→\nor\nA\nD\nJump\nSPACE\n\nWatch your step. Fire, water and wandering creatures are all bad news.\n\n↻   RESTART LEVEL\nA fresh start is always an option.\nBUILT FOR THE BOLD   /   EST. 1984\nGOOD LUCK, ADVENTURER.","images":"attached"}
assistant
 
thinking
**Testing key press functionality**

I need to determine if a key press can be instantaneous, which might allow for slight movement. I'm wondering if the browser can handle just a single key input, like "ArrowRight," without needing to hold it down. Should I test this with an external tool like Playwright? The browser API seems to support single key presses, so I might need to run Playwright via bash and check my environment to see if everything works smoothly.
→ bash {"command":"ls -la; node -e \"try {console.log(require.resolve('playwright'))} catch(e) {console.log('no playwright')}\"; which chromium || 
toolResult
 
total 28
drwx------  3 node node  4096 Oct 26 23:47 .
drwxrwxrwt 10 root root  4096 Oct 26 23:47 ..
drwxr-xr-x  4 node node  4096 Oct 26 23:47 .home
-rw-r--r--  1 node node 13177 Oct 26 23:47 index.html
no playwright

assistant
 
thinking
**Exploring key press functionality**

I'm speculating about how the browser key sends commands for key presses and releases, maybe even in real-time. I'm thinking a test could involve using the space key to see how it responds to motion. It’s interesting to ponder the mechanics of how that all works!  I wonder if there's a specific way to implement this, or if there's an unexpected behavior that might emerge during testing.
→ browser {"action":"key","x":0,"y":0,"toX":0,"toY":0,"text":"Space","delta":0}
toolResult
 
Frame 1, +0ms
[Browser image supplied to model]
{"console":[],"dom":"◆\nAN ARCADE ADVENTURE\nDANGER RUN\nA LITTLE DANGER. A LOT OF GLORY.\n01   /   THE GILDED EXIT\nREADY TO EXPLORE\nEXPEDITION 01   THE OLD RUINS\nTROPHY: NOT FOUND\n// THE MISSION\nFortune favors\nthe brave.\n\nMake your way through the ruins, claim the golden trophy, and find the way out.\n\n♛\nOBJECTIVE 01\nCollect the trophy\n▣\nOBJECTIVE 02\nReach the exit alive\n// HOW TO PLAY\nMove\n←\n→\nor\nA\nD\nJump\nSPACE\n\nWatch your step. Fire, water and wandering creatures are all bad news.\n\n↻   RESTART LEVEL\nA fresh start is always an option.\nBUILT FOR THE BOLD   /   EST. 1984\nGOOD LUCK, ADVENTURER.","images":"attached"}
assistant
 
thinking
→ browser {"action":"motion","x":0,"y":0,"toX":0,"toY":0,"text":"","delta":0}
toolResult
 
Frame 1, +0ms
[Browser image supplied to model]
Frame 2, +555ms
[Browser image supplied to model]
Frame 3, +1119ms
[Browser image supplied to model]
Frame 4, +1674ms
[Browser image supplied to model]
{"console":[],"dom":"◆\nAN ARCADE ADVENTURE\nDANGER RUN\nA LITTLE DANGER. A LOT OF GLORY.\n01   /   THE GILDED EXIT\nREADY TO EXPLORE\nEXPEDITION 01   THE OLD RUINS\nTROPHY: NOT FOUND\n// THE MISSION\nFortune favors\nthe brave.\n\nMake your way through the ruins, claim the golden trophy, and find the way out.\n\n♛\nOBJECTIVE 01\nCollect the trophy\n▣\nOBJECTIVE 02\nReach the exit alive\n// HOW TO PLAY\nMove\n←\n→\nor\nA\nD\nJump\nSPACE\n\nWatch your step. Fire, water and wandering creatures are all bad news.\n\n↻   RESTART LEVEL\nA fresh start is always an option.\nBUILT FOR THE BOLD   /   EST. 1984\nGOOD LUCK, ADVENTURER.","images":"attached"}
assistant
 
thinking
→ browser {"action":"key","x":0,"y":0,"toX":0,"toY":0,"text":"Space","delta":0}
toolResult
 
Frame 1, +0ms
[Browser image supplied to model]
{"console":[],"dom":"◆\nAN ARCADE ADVENTURE\nDANGER RUN\nA LITTLE DANGER. A LOT OF GLORY.\n01   /   THE GILDED EXIT\nREADY TO EXPLORE\nEXPEDITION 01   THE OLD RUINS\nTROPHY: NOT FOUND\n// THE MISSION\nFortune favors\nthe brave.\n\nMake your way through the ruins, claim the golden trophy, and find the way out.\n\n♛\nOBJECTIVE 01\nCollect the trophy\n▣\nOBJECTIVE 02\nReach the exit alive\n// HOW TO PLAY\nMove\n←\n→\nor\nA\nD\nJump\nSPACE\n\nWatch your step. Fire, water and wandering creatures are all bad news.\n\n↻   RESTART LEVEL\nA fresh start is always an option.\nBUILT FOR THE BOLD   /   EST. 1984\nGOOD LUCK, ADVENTURER.","images":"attached"}
assistant
 
thinking
→ browser {"action":"key","x":0,"y":0,"toX":0,"toY":0,"text":"ArrowRight","delta":0}
toolResult
 
Frame 1, +0ms
[Browser image supplied to model]
{"console":[],"dom":"◆\nAN ARCADE ADVENTURE\nDANGER RUN\nA LITTLE DANGER. A LOT OF GLORY.\n01   /   THE GILDED EXIT\nREADY TO EXPLORE\nEXPEDITION 01   THE OLD RUINS\nTROPHY: NOT FOUND\n// THE MISSION\nFortune favors\nthe brave.\n\nMake your way through the ruins, claim the golden trophy, and find the way out.\n\n♛\nOBJECTIVE 01\nCollect the trophy\n▣\nOBJECTIVE 02\nReach the exit alive\n// HOW TO PLAY\nMove\n←\n→\nor\nA\nD\nJump\nSPACE\n\nWatch your step. Fire, water and wandering creatures are all bad news.\n\n↻   RESTART LEVEL\nA fresh start is always an option.\nBUILT FOR THE BOLD   /   EST. 1984\nGOOD LUCK, ADVENTURER.","images":"attached"}
assistant
 
thinking
**Exploring automation options**

I'm considering whether I can simulate key input quickly using automation by injecting JavaScript in the browser. However, it doesn't seem feasible since the browser tool only handles certain interactions. I wonder if I might utilize the Chrome DevTools Protocol (CDP) instead. There might be some functionality available if the browser tool is actively listening in that environment. It's all a bit uncertain, so I need to think this through carefully!
→ bash {"command":"env | grep -Ei 'browser|chrome|playwright|cdp' || true; ls /app/pipeline/node_modules | head","timeout":10}
toolResult
 
PLAYWRIGHT_BROWSERS_PATH=/opt/playwright
@cloudflare
@earendil-works
@sinclair
entities
parse5
playwright
playwright-core
yaml

assistant
 
thinking
**Exploring automation with Playwright**

I'm considering using Playwright via an absolute path with Chromium for browser automation. I'll implement a script in Node to run headlessly, manage screenshots, and simulate key presses in real-time. I need to validate platform jumps and test controls on a controlled schedule. For data inspection, I might have to instrument the page temporarily to expose its state without modifying the final file. I also want to ensure a complete standalone browser setup while dynamically loading content during tests. Let's focus on automating the initial movements and jumps!**Planning movement and testing**

I think I’ll start by moving right for 160ms to get to x98, then jump right for about 400ms to reach x180, and then settle at y384 on the top platform. I want to read data through an exposed state after that. I also need to test different scenarios like restarting, losing, or exiting when locked. I plan to manipulate the state to check outcomes, focusing on real movement rather than just the route. I’ll make sure to follow the user’s requests while testing!
→ bash {"command":"node <<'NODE'\nconst {chromium}=require('/app/pipeline/node_modules/playwright'); const fs=require('fs');\n(async()=>{const brow
toolResult
 
start {
  player: {
    x: 65,
    y: 440,
    w: 25,
    h: 40,
    vx: 0,
    vy: 0,
    grounded: true,
    facing: 1
  },
  enemy: { x: 644.1963999999996, y: 451, w: 30, h: 29, dir: 1 },
  hasTrophy: false,
  state: 'playing',
  notice: ''
}
move {
  player: {
    x: 99.15300000000002,
    y: 440,
    w: 25,
    h: 40,
    vx: 205,
    vy: 0,
    grounded: true,
    facing: 1
  },
  enemy: { x: 656.6675999999991, y: 451, w: 30, h: 29, dir: 1 },
  hasTrophy: false,
  state: 'playing',
  notice: ''
}
jump1 {
  player: {
    x: 165.75000000000003,
    y: 344,
    w: 25,
    h: 40,
    vx: 0,
    vy: 0,
    grounded: true,
    facing: 1
  },
  enemy: { x: 619.6644000000016, y: 451, w: 30, h: 29, dir: -1 },
  hasTrophy: false,
  state: 'playing',
  notice: ''
}
jump2 {
  player: {
    x: 288.7500000000002,
    y: 370.33344700000004,
    w: 25,
    h: 40,
    vx: 0,
    vy: 640.0000000000003,
    grounded: false,
    facing: 1
  },
  enemy: { x: 627.7355999999991, y: 451, w: 30, h: 29, dir: 1 },
  hasTrophy: false,
  state: 'playing',
  notice: ''
}
jump3 {
  player: {
    x: 329.7500000000002,
    y: 440,
    w: 25,
    h: 40,
    vx: 205,
    vy: 0,
    grounded: true,
    facing: 1
  },
  enemy: { x: 641.335599999999, y: 451, w: 30, h: 29, dir: 1 },
  hasTrophy: false,
  state: 'lost',
  notice: ''
}
restart {
  player: {
    x: 65,
    y: 440,
    w: 25,
    h: 40,
    vx: 0,
    vy: 0,
    grounded: true,
    facing: 1
  },
  enemy: { x: 631.8, y: 451, w: 30, h: 29, dir: 1 },
  hasTrophy: false,
  state: 'playing',
  notice: ''
}
errors []

assistant
 
thinking
**Figuring out jumping strategy**

I’m realizing that the jump from x165 is wrong because I need to position myself towards the end before jumping. It’s physically reachable, but I should start by walking to the first platform at x240. From there, I can jump to x320, and at y344, I’ll have the edge at x288. I think walking to x260 and jumping from 250 to the target at x350 for the third jump might work. I definitely need to test this fully!
→ bash {"command":"node <<'NODE'\nconst {chromium}=require('/app/pipeline/node_modules/playwright'); const fs=require('fs');\n(async()=>{let b=awai
toolResult
 
first {
  player: {
    x: 165.75,
    y: 344,
    w: 25,
    h: 40,
    vx: 0,
    vy: 0,
    grounded: true,
    facing: 1
  },
  enemy: { x: 631.0000000000014, y: 451, w: 30, h: 29, dir: -1 },
  hasTrophy: false,
  state: 'playing',
  notice: ''
}
edge {
  player: {
    x: 237.5205,
    y: 344,
    w: 25,
    h: 40,
    vx: 205,
    vy: 0,
    grounded: true,
    facing: 1
  },
  enemy: { x: 606.0644000000024, y: 451, w: 30, h: 29, dir: -1 },
  hasTrophy: false,
  state: 'playing',
  notice: ''
}
second {
  player: {
    x: 350.24999999999994,
    y: 280,
    w: 25,
    h: 40,
    vx: 0,
    vy: 0,
    grounded: true,
    facing: 1
  },
  enemy: { x: 640.1999999999988, y: 451, w: 30, h: 29, dir: 1 },
  hasTrophy: false,
  state: 'playing',
  notice: ''
}
edge2 {
  player: {
    x: 401.50000000000006,
    y: 280,
    w: 25,
    h: 40,
    vx: 205,
    vy: 0,
    grounded: true,
    facing: 1
  },
  enemy: { x: 657.1999999999987, y: 451, w: 30, h: 29, dir: 1 },
  hasTrophy: false,
  state: 'playing',
  notice: ''
}
third {
  player: {
    x: 507.40300000000025,
    y: 216,
    w: 25,
    h: 40,
    vx: 0,
    vy: 0,
    grounded: true,
    facing: 1
  },
  enemy: { x: 618.5288000000004, y: 451, w: 30, h: 29, dir: -1 },
  hasTrophy: true,
  state: 'playing',
  notice: 'TROPHY FOUND! NOW FIND THE EXIT'
}
trophy {
  player: {
    x: 548.3825000000004,
    y: 216,
    w: 25,
    h: 40,
    vx: 205,
    vy: 0,
    grounded: true,
    facing: 1
  },
  enemy: { x: 604.9356000000005, y: 451, w: 30, h: 29, dir: -1 },
  hasTrophy: true,
  state: 'playing',
  notice: 'TROPHY FOUND! NOW FIND THE EXIT'
}
restart {
  player: {
    x: 65,
    y: 440,
    w: 25,
    h: 40,
    vx: 0,
    vy: 0,
    grounded: true,
    facing: 1
  },
  enemy: { x: 632.9355999999999, y: 451, w: 30, h: 29, dir: 1 },
  hasTrophy: false,
  state: 'playing',
  notice: ''
}

assistant
 
thinking
**Testing route possibilities**

I think I could route for a win from the platform by running off to the right and landing past the enemy to fire. If I calculate the fall based on height and distance, it seems it should land around x690. My jump from the edge could extend horizontally to around 250, landing at 800 if I jump at x550 or 560. The third platform ends at x608, so it might work to jump at x560 and hold horizontally for about a second. I need to test this route!
→ bash {"command":"node <<'NODE'\nconst {chromium}=require('/app/pipeline/node_modules/playwright');const fs=require('fs');(async()=>{const b=await
toolResult
 
before final jump {
  player: {
    x: 565.4795000000001,
    y: 216,
    w: 25,
    h: 40,
    vx: 205,
    vy: 0,
    grounded: true,
    facing: 1
  },
  enemy: { x: 607.2068000000005, y: 451, w: 30, h: 29, dir: -1 },
  hasTrophy: true,
  state: 'playing',
  notice: 'TROPHY FOUND! NOW FIND THE EXIT'
}
after final jump {
  player: {
    x: 814.8825000000015,
    y: 440,
    w: 25,
    h: 40,
    vx: 0,
    vy: 0,
    grounded: true,
    facing: 1
  },
  enemy: { x: 645.7288, y: 451, w: 30, h: 29, dir: -1 },
  hasTrophy: true,
  state: 'playing',
  notice: 'TROPHY FOUND! NOW FIND THE EXIT'
}
exit {
  player: {
    x: 845.6325000000015,
    y: 440,
    w: 25,
    h: 40,
    vx: 205,
    vy: 0,
    grounded: true,
    facing: 1
  },
  enemy: { x: 635.5288, y: 451, w: 30, h: 29, dir: -1 },
  hasTrophy: true,
  state: 'won',
  notice: 'TROPHY FOUND! NOW FIND THE EXIT'
}
locked {
  player: {
    x: 865,
    y: 440,
    w: 25,
    h: 40,
    vx: 0,
    vy: 0,
    grounded: true,
    facing: 1
  },
  enemy: { x: 646.5356, y: 451, w: 30, h: 29, dir: 1 },
  hasTrophy: false,
  state: 'playing',
  notice: 'THE EXIT IS LOCKED — FIND THE TROPHY'
}

assistant
 
thinking
→ browser {"action":"click","x":1028,"y":648,"toX":0,"toY":0,"text":"","delta":0}
toolResult
 
Frame 1, +0ms
[Browser image supplied to model]
{"console":[],"dom":"◆\nAN ARCADE ADVENTURE\nDANGER RUN\nA LITTLE DANGER. A LOT OF GLORY.\n01   /   THE GILDED EXIT\nREADY TO EXPLORE\nEXPEDITION 01   THE OLD RUINS\nTROPHY: NOT FOUND\n// THE MISSION\nFortune favors\nthe brave.\n\nMake your way through the ruins, claim the golden trophy, and find the way out.\n\n♛\nOBJECTIVE 01\nCollect the trophy\n▣\nOBJECTIVE 02\nReach the exit alive\n// HOW TO PLAY\nMove\n←\n→\nor\nA\nD\nJump\nSPACE\n\nWatch your step. Fire, water and wandering creatures are all bad news.\n\n↻   RESTART LEVEL\nA fresh start is always an option.\nBUILT FOR THE BOLD   /   EST. 1984\nGOOD LUCK, ADVENTURER.","images":"attached"}
assistant
 
Created `index.html`.

Checked movement, jumping and landing, trophy collection, the route to victory, locked-exit feedback, and restart. The browser console showed no errors. Fire and enemy collisions were not individually tested.