[[PLEASE READ INSTRUCTIONS]] Click on the background to paint. Click on the colored circle (or press "Z" on the keyboard) to change paint color. Click on the paint drag button (or press "X" on the keyboard) to toggle paint drag on and off. Paint drag is a setting that allows you to "drag" the paint across the background (although you can do the same when it's turned OFF, it's much more strict than if it's turned ON). Click on the Erase button to remove all paint on-screen. Click on the perfect lines button (or press "C" on the keyboard) to toggle perfect lines on and off
The "splash" and "plunge" sounds are from the Scratch Sound Library, except they're sped up. The other sounds are recorded.