Simple Math has never been this addictive!
Think you are above basic Math?
Wait till you have a timer beside you that will explode if you take your own sweet time to answer :-)
Better yet, gather with your friends and see who will "explode" first ;-p
P:S Even though you can play this game alone, this Game was intended to be a group game, hence the volume are intentionally loud [once you set to maximum volume], the idea is allow the group to easily identify who is out of the game.