173. Mutamons

Mutamons is a classic collectible card game in which players build monsters with collectible cards, then watch their monsters fight in AR. The game was developed in pre-Fall Korea, but during the fall the company and all records of copyright were destroyed. The game was rediscovered post-Fall and, released as open-source and substantially remade, became popular as a form of free entertainment. The open-source community greatly expanded the number of cards, and reworked the games AR software, so that every monster created, even if by the same combination of cards, will be unique.