Tap a box to move it forward. When a box hits an obstacle, it turns right. Collide boxes of the same color to destroy them and win!
Tap a box to move it in the direction it is facing in! They turn automatically to the right when it hits something. When it hits a box of the same color, they get destroyed, and the other adjacent same-colored boxes. Later levels involve walls that can only be opened when all yellow squares are collected and walls that slide when a box hits the corresponding wall.