Procedural Content

DROD is a game that autistic people might enjoy while on methamphetamine. Its a turn-based, dungeon crawling puzzle-game. The way that works is: you can move in one of eight directions, you can wait, and you can turn your sword clockwise and counter-clockwise, and every time you execute one of those verbs, a turn passes. Every turn, other things in the tile-gridded room you're in will move, and every x amount of turns spawn units will create things that move. Thats pretty much DROD, "invented" (because it is so primally iconic a game design) by Eric Hermansen back in the 90s. Since then, it has expounded on that simplicity with so much manic variation that thousands of people have subscribed to Caravel Net and flooded its message boards with help requests, new content ("Holds" as it were) and all kinds of crystallized culture only possible in a hardcore gaming super-niche like the DROD series.