This is falling block game. If you align 3 or 4 same cats in a straight line, the cats will disappear. This "line" means horizontal line or vertical line. Then, the other remaining cats will fall down. On this occasion, if there are other straight lines which have 3 or 4 consecutive same cats, then they will disappear as well. This is called "chain". This games purpose is to make as many chains as possible. If you push left or right sign button, then the controlled cats will go left or right. If you push down sign button, the cats will go down quickly. If you tap the rightmost or the leftmost button, then the cats will rotate.