The object of the game is to change the color of all tiles to the target color.

The color change follows one of two patterns: change of type "+" and change of type "x". Touching tile in "+" mode changes the colors of adjacent tiles adjacent to the touched by the sides. Touching tile in "+" mode changes the colors of adjacent tiles adjacent to the one touched by the corners.
Changing the colors of the tiles after touching them can be done according to one of two patterns:
· in 2-state mode, the touched white tile turns black, and vice versa,
· in 3-state mode, the white tile turns gray, black, and white again.