A playable game is one of the most unforgiving artifacts to generate. The model must design player input, physics, collision detection, collectibles, a win condition, and a reset flow — all in a single file — and the result has to be fun enough that a real human can complete it.
This category deliberately keeps the prompt short (“a platformer with run, jump, coins, and a goal flag”) to see how much implicit structure the model fills in: parallax backgrounds, coyote time, sound, particles, UI chrome.
Common failure modes
- Collision detection done backwards lets the player fall through floors or stick to walls.
- State leaks between runs mean reset leaves coins collected or the win flag already triggered.
- No frame-independent motion makes the game feel different on 120Hz vs 60Hz displays.
Task: Mini Platformer
Build a Canvas 2D platformer level. Playability, collision correctness, and absence of game-breaking bugs are the scoring pillars.