It's a simple arcade game which tests your patience and reflexes. There is a bouncing ball you cannot control directly, it keeps bouncing from one tile to the next one. What you can control is the tile the ball is about to bounce on. Once it touches the tile it's too late and it jumps to whereever the tile sends it (and you are in control of the next tile it is going to bounce on). For some it may take some time to get used to, but it's challenging even if you are a natural. There is more about the game on its web site (up.qnell.com), including a free level editor for PCs and Macs. Enjoy.