Tetris

MAT Solutions · The Lab

Tetris: a complete implementation in a single file

A full, playable Tetris written to answer a narrow question: would the game loop, piece rotation and collision handling stay readable if all of it lived in one file? They did, which is the only result worth reporting.

Tetris is a better test than it looks. The rules are small enough to hold in your head and exact enough that a mistake is obvious the moment you play, so there is nowhere for a sloppy implementation to hide. Rotation against a wall and a piece landing one row too early are both visible in seconds.

What it does

• Complete, not a demoGame loop, rotation, collision, scoring and levels, all playable.
• One fileWritten as a single self-contained page with no build step and no dependencies.
• Instantly falsifiableAny error in the rules shows up in play rather than in a test report.

Built in 2025 as an implementation exercise. Plays in the browser with no install.

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