A simple Snake game (that you can't play) I wrote to learn about deterministic simulation testing (DST). Games are fully reproducible from a seed and commit. The fuzzer generates seeds, plays games to completion, and tracks the highest score. Inputs are biased towards good moves (prefer not dying, prefer moving towards food) to push games further along.
Here's what the best game looked like after 10 hours of fuzzing:
One fun hack was how I kept track of seeds. The fuzzer prints the command to reproduce each new high
score. Every replay I run gets saved to shell history so my fish history is the fuzzing
database.
