DeathMath HD is currently in review in the Apple app store. Two players play head to head to complete a math puzzle and race to finish before the other player. Its quite intense. The premise is simple. A random number appears and each player needs to arrange each dice and operands (-/+x) so that they can reach the target number exactly. Its a great way to find out who is the top math whiz among your friends and its quite fun if numbers dont scare you.