Think you are good at Tic Tac Toe? Try this Tic Tac Toe Cube. Win as many boards as you can in the shortest time possible. Rotate the Cube in any direction to switch between boards.
It's not really 3 dimensional... just 6 games of TTT on 6 different surfaces. Still, it's fun. The sound effects are annoying, though, and there's no way to turn them off.