This game's pretty addicting in my opinion. You have to protect yorp(s) from hitting the bottom of the screen by bouncing them up with a blue ball you control. Meanwhile, you have to get all of the out-of place yorps hidden in the tiling yorp background around the screen. Getting all of them without letting a bouncing yorp hit the bottom will progress you to the next level. It gets pretty hard when there are multiple bouncing yorps.