The idea is pretty simple, really. You have a shape that you try and place on the surface of the sphere, if the tiles that you hit when you place that shape correctly match the shape that you placed, then that tile, and the like ones touching it will be destroyed. The game throws shape after shape at you as you bust your way through layers of the gameboard shell until you get to the glowing-white center of the sphere. From there, it's just a matter of widening the hole until you expose enough of the central sphere to beat the level.