Any DOS adventure game from the 90s that maliciously threw impossible puzzles at you on a whim with no hints. The Dig is a fun one. In terms of board games, th

Any DOS adventure game from the 90s that maliciously threw impossible puzzles at you on a whim with no hints. The Dig is a fun one. In terms of board games, the game of Hex is mathematically interesting in that the impossibility of a draw can be utilized to prove Brouwer's fixed-point theorem.