Move the Scratch Cat up and down with the arrow keys.
I don't know how often Scratch checks to see whether two sprites are in contact, but each time the ball passed across the cat, it registered as more than one contact. I used the "wait" command to build in a brief [.2-second] delay after the score was raised. By that time, the ball would no longer be in contact with the cat, so only one point would have been scored.
