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Maze generator & solver · gpt-5-mini

Generate a random maze with the recursive-backtracker algorithm on a canvas, then animate an A-star or BFS solver finding the path from start to finish.

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transcript · 4 messages
user

Generate a random maze with the recursive-backtracker algorithm on a canvas, then animate an A-star or BFS solver finding the path from start to finish.

assistant
thinking
**Considering maze generation and solving**

I'm focused on using A* while considering neighbor connectivity with walls removed. I imagine visuals where I draw walls and color visited cells and paths differently. Starting from the top-left and aiming for the bottom-right, I'll need controls like buttons for generating a new maze, toggling animation, and selecting algorithms. Keeping things simple, I think of using an iterative recursive backtracker for maze generation, and I'll implement this as a generator function so that it can animate the solving process, too.**Implementing pathfinding and maze visuals**

I need to highlight the path once it’s found and make sure the canvas size fits the container while scaling for clarity. I’ll create cells in a 2D array, managing wall bits, and ensure the algorithms only recognize neighbors when walls are removed. For A*, each neighbor has a cost of 1, and I’ll use generators to yield objects that contain information needed for drawing. The main animator will call these generators in a way that allows for a smooth visual update. I'll also set up the HTML structure for canvas and controls, ensuring everything is neatly organized.
write index.html (17065 bytes)
toolResult

Successfully wrote 17065 bytes to index.html

assistant

I've created index.html in the current directory. It contains a self-contained single-page app that: - Generates a random maze using the recursive backtracker algorithm (animated). - Animates solving the maze using either A* or BFS. - Lets you set columns, rows, cell size, animation speed, and choose solver. - Click the canvas with Shift to set a new start or Ctrl/Cmd to set a new goal. - Buttons: New Maze, Generate (animate), Solve (animate), Solve (instant), Clear. Open or load index.html in a browser to run it.

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-5-mini
vendorOpenAI
harnesspi-agent
generated2026-07-22

EVALUATION

1/5 broken

Empty grid canvas with only start/goal markers; no maze walls, generation, or solving animation ever appears.

off-prompt

Vision grade · anthropic/claude-sonnet-5

MEASUREMENTS

Raw readings from the capture, not a verdict — the grade above is the only judgement. Percentages are how much of the screen changed; the measure under-reports sparse motion on a dark background.

idle motion0.0%
on click0.0%
on drag0.0%
on wheel0.0%
on enter + space0.0%
on arrow keys0.0%
on w/a/s/d0.0%
frame spread112.8 / 255
console errors0
js errors none

METRICS

runtime118.0s
tokens in6.7k
tokens out6.2k
cached1.0k
cost / run$0.0141