Hacker News new | ask | show | jobs
by hoten 1365 days ago
It's likely a hash of the game state. They save input and playback recordings of the game, expecting to always receive the same hash for the game state every frame.

Just this week I started on a similar system for a game engine I work on (Zelda Classic). Main reason was for testing purposes, but another benefit is that it is SO cool to see the game replayed for you. Like those self playing pianos.