During the Galaga demonstration, wait until the Galaga Commander uses the tractor beam. Before it sucks up the ship, press fire and kill it. You now have total control and can play the sample level.

To activate the running timer for Galaga Arrangement, the button sequence is Left, Right, Left, Right, Button 1, Button 2, Button 1, Button 2. This needs to be done before you press Start at the ...