Download Number Invaders – Substract
Number Invaders - Substract is a clone of the classic Space Invaders in which you cannot simply shoot down the "enemies." They are not space ships, but numbers, and you will have to make different calculus in order to take them down. In the upper area of the screen you receive an equation and you will have to type its result in order to blow up the number off the arena.
The game has different difficulty levels and you can play this game by yourself but you can also allow your child to learn calculus if you lower the difficulty level and give him less possible results.