Press the green flag to start, the up arrow to make the sprite bigger, the down arrow to make the sprite smaller, and the left/right arrows to rotate it. Press the space bar to clear everything. Also, here's a guide to the costumes. 0=CAT, 1=BALL, 2=CHEESY PUFFS, 3=FLOWER, 4=RAINBOW, 5=SCRATCH LOGO, 6=TACO, 7=CRAB, 8=GOBO THE SPRITE-MAN, 9=APPLE Also, press the Q key to change the color of the backdrop.
The original backdrop that it starts with is orange. If you want it to change with the cat, change the color by pressing Q and then click the flag again. Or, you can just change the color of the background by pressing Q and then leaving it.