Press [Esc] during game to display the options menu. Then type "glazed donut" to activate cheat mode. Press one of the following key combinations to activate the corresponding cheat. (A tone will confirm correct entry.)
Cheat Hotkey
5 extra lives * [Command] + [F12]
Alternate appearance [Command] + [F7] or [F8]
Beach ball [Command] + K
Cloak [Command] + B
Invisio power [Command] + I
Morph [Command] + T
Previous level [F3]
Skip level [F4]
Toggle scrolling [Command] + S
Unlimited bombs * [Command] + 8 * 1P mode games only.