From CKS Games:
Super Math Invaders will make you save the universe from the Math Invaders with your mathematical prowess. Fire Plus, Minus, Multiply and Divide rockets at the invaders to bring their health down to *exactly* zero to defeat them. Unique, one-of-a-kind gameplay that challenges your mental Math reflex. 10 levels, 93 waves of thrilling Math battles. Unlock 10 types of Invaders, each with increasingly challenging ability to sabotage your world-saving endeavour. Math Invaders is another thought-provoking gameplay experience that combines puzzle-solving fun, action-packed excitement and educational benefits.