Play a pixel art retro arcade shooter to defend Earth from alien invaders. Shoot enemies, collect power-ups, and upgrade weapons. Explore levels with increasing difficulty and unlock new characters. Compete in leaderboards and share achievements.
Teaches basic math operations including addition with carries, subtraction with regrouping, multiplication, and division. Allows users to practice problems without ads or in- purchases.
The app displays addition and multiplication tables as colorful quilts. It assigns a specific color to each positive whole number, making it easier to discover patterns in mod arithmetic.
