ARKANOID 3, Revenge Of Doh (Imagine)
 
When the pink loading screen appears, hold down Caps Lock and type IMAGINE.
When the opening bit plays, type PETEJOHNSONWANTSCHEAT.  Now, when you press
S, it causes both exits to open, and you can go on to the next screen without
finishing it.  Or, type DALEY88 instead at the pink screen, and you can now
restart at the level you last died on!