sum! sum! zero! is a "two on one" turn-based strategy game, oriented to casual players, where wins the player who gets more points (sum! sum!) or stay closer to zero (zero!), finding the best strategy to achieve that goal before your opponent. The game is simple to learn and play, ideal for all ages or non habitual players. The game allows you to create your own profile to play with friends online on full version, and sharing the same device playing with other opponent or against the CPU on try-out version. sum! sum! zero! is available on Windows Phone Store at $1.29, or without online playing version for free.