Games are written in a functional/declarative notation, consisting of rules; for example, the Sokoban rule allowing the player to push a crate is written as:
[ > Player | Crate ] -> [ > Player | > Crate ]
Graphics are deliberately kept simple, with elements being 5x5 blocks of coloured pixels, giving the game a vaguely Atari 2600-esque aesthetic.
There is a gallery of games made by users, each with an animated GIF representing the game's play. Some examples:
Games were originally turn-based (in that nothing happened except when the player moved), but there is an experimental real-time feature. Somebody has already coded a (semi-functional and not particularly exciting) Pac-Man clone.
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