My gaming group recently got together after a too-long hiatus to play a game of Mazes & Minotaurs:
...as our GM explained it to me, Mazes & Minotaurs grew out of a discussion on an RPG forum that asked the question, "What if Gary Gygax & Dave Arneson had been inspired by Greek mythology instead of fantasy literature?" Someone took the idea and ran with it, and published a role-playing game, complete with an imaginary publishing history & backstory. The best part is that you can download it it for free here. Overall it was a fun game for a quick one-shot, and I had a great time!