Click a plank to grab it, click again to drop it. Use the left and right arrow keys to turn planks. Get the ball to the exit. The square buttons next to the inventory are for volume, restart level, skip level, and level select. You can only skip a level so many times, you get more skips the more levels you complete. Beware, this game is harder than it looks.
Armed with planks and other odd instruments, you are going to get a little steel ball to an exit. Why? because it is addicting. I could not stop "testing" this. Feel free to remix.