This simple, yet satisfying, card game makes a little math go a long way. Players take turns adding cards to the stack, increasing the total as they play. Every time they double down (make a total of 11, 22, 33, etc.) or go over 99 they lose a chip. Action cards double the fun, switching the direction of play or forcing other players to play an extra card. As the total rises so does the tension, until the last player holding a chip wins the game.