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!