2 Players must erase squares by crossing them with balls from two different sides: vertically or horizontally.
Erasing squares activates more dificulties: balls responding to opposite instructions, the squares move around, and a blinking ball.
It is a computer version of an optional feature of the Etch-A-Sketch game where a grid with squares was placed on the screen.
Player A moves horizontally and Player B vertically.
They move a ball in order to cross squares from different sides.
