Math Planet Defense

Learn math by playing planet defense game.

Features:
* Story from your first duty until you achieve "General" rank in the military.
* Learn math (addition, subtraction, multiplication, division) from beginner to expert.
* Learn planets (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto) within our Solar System.
* Select different spaceships with unique gun and laser.
* Difficulty levels and scoring based on planets.
* Top score is recorded with your name, and you can have rank after complete a mission. You can compete with your family to achieve the top scorer.