The scratch cat will follow your mouse pointer and always point in its direction. To use the pen, simply hold down the space key. To start ALL THE WAY OVER, press 0.
I usually thank nobody and no one, but come to think of it, I need to edit almost all my projects and thank my links teachers, Ms. Lockwood and Ms. Hartnett, for teaching me what scratch was and how to use it in the first place!