After losing last life, go to title screen, press caps lock and type MAGENTA. Press S during play.
Programmer's message
Hit all function keys (F1, F2, etc.) simultaneously to see a hidden message from the programmer.
Unlimited lives
High score screen
Password - Effect
DEBBIE S' - Unlimited lives
Various Cheats
Allow the game to return to the title screen after losing your last life, then enter the following.
Code - Effect
[Caps Lock] type "ROBOCOPPETER" - Return to gameplay as if you never lost your last life
[Caps Lock] type DALEY-88 - Revive at last level attempted
[Caps Lock] type "WHENWORLDSCOLLIDE", press S during gameplay - Skip level
View RoboCop Screen
While the game is loading, hold down the Right Mouse Button to see an image of RoboCop.