Move with the arrow keys to get to the blue-and-yellow rectangle at the side of the screen. But be carful not to touch the invisible walls! This may be hard, as they are invisible. The dots, however, do give a basic outline of where these walls are. They will only appear INSIDE the walls. But just because there are no dots there does not mean there is no wall. There are 7 levels to complete. Each level, there are less dots, making it harder.
Sorry about the loading time, but I couldn't avoid it. It's only a few seconds after each level, and it gives you time to love and fav it ;)