Infinitron is a tactical board game in which players create the board, the units, and even the rules as they play the game. It started the Infinifranchise, and, in hindsight, sort of resembles a less pedantic nomic. Information about Infinitron can be found in the Infinifranchise Post-Mortem.
While Infinitron is somewhat playable, the rules aren’t necessarily balanced, or that fun. I’ve played one game of Infinitron, with two friends – it lasted 8 hours, and I’m pretty sure everyone was unhappy by the end. But, that doesn’t mean you won’t necessarily enjoy it!