The object of the game is to trap all of the bosses in walls of their own colors before they reach you.
There are bosses in four different colors and lines (cubicle walls) in corresponding colors.
The bosses cannot cross cubicle walls of their own color.
Select a rotation direction, then tap any black dot to rotate the cubicle walls.
On each turn you are allowed a certain number of rotations before the bosses can move, as indicated at the top of the game screen.

Good luck!!