Scratch away to your heart's content and see your doodles against different board types.
Controls The top left area relates to scratch size - there are 5 preset sizes or you can use the arrows to increase/decrease the size manually (2-20). The control area next to that works in the same way, but alters the pressure (20-100). The coloured bars in the top right change the board type. The curly arrow clears the board.
If you make something awesome with it take a screenshot and send it my way!
It turned out kind-of awful, but it was fun nonetheless.