Go run a game at 24fps, it will be unplayably bad.
Over-exaggeration at its finest.
You can technically play a game at any fps, it just won't be nice. Probably from around 8fps you could run a game such that you're actually controlling your character properly. That doesn't mean it wouldn't be the shoddiest game experience in the world. 24 FPS looks noticeably awful, and in 2012 it would prevent me from playing a game.