Exhibit No. 011 · Games

Tetris in one file

A complete Tetris with rotation, line clears, levels and a next-piece preview.

Prompt

> Create a complete, playable Tetris game in a single HTML file.

What it tests

Grid logic, rotation edge cases and game-state handling.

Origin

Community classic

Prompt wording adapted from the original.

Difficulty

●●●

Results

Verdicts are our own assessment of each answer.

Claude Opus 5.5

Pass

Run on 2026-10-19Open the raw answer

Test conditions

Single attempt per test, no retries and no edits afterwards. Run inside a Claude Code agent session, which includes its own system prompt, rather than the raw API.

All results for Claude Opus 5.5

Run it yourself

Paste the prompt into the model or agent you want to test. Save the answer as a .html file and open it in a browser.

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Exhibit No. 010Pass

Flappy Bird in one file

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Build a complete, playable Flappy Bird from a single sentence.