Defend your base from invaders and stray asteroids! Answer Math Questions correctly to defeat your enemies and level up your planetary presence! Collect gold by answering questions correctly to build your defences, but be careful every 3 wrong answers will spawn more attacks! Start the game by hitting play. Then select the grade and math skill you want to practice. Afterwards answer questions correctly to gain gold you can use for power ups and other items.
Click a stone you want to use and drag your mouse over one of the arrows, then release. The numbers on the stones is the mount of other stones that will be placed in the direction you chose. Try to place one of the stones in the outlined zone, by stepping stones over other stones.