Spazy is a game based on spatial calculation made funny. This game consists on going through the walls that appears on your way, the hard thing, is that you cant move the cube however you want, the cube is always moving side to side and you have to calculate when to start moving the opposite side to get in between the walls. Harder than you think, funny as you think.
Play with more than 20 different players that are ALL free (but you have to earn them).