there are 3 squares. they are constantly on the move. they push off from the walls in a random direction. figures cannot pass through other figures. the figures are pushed against other figures. they change color when bouncing. two identical colors will not change color. there are only 3 colors. red, blue, green. all figures are repelled from the finger. if squares with the same color collide, they are combined into one larger square. when one square disappears, another square appears in a random place.