Press ESC then put in one of the following codes

IAINTSCARED Invincibility
SHOWMETHEMAZES Get All Levels
INEEDTHEPOINTS Level Win
INEEDANEXIT Level Win
HONEYISHRUNKPACMAN Tiny PacMan
HONEYIBLEWUPPACMAN Pacman goes Boom
UPCLOSEANDPERSONA 1st Person View
BEINGPACMANOVICH 1st Person View
GETALIFE Get 1 Life
KILLME Pac dies
PACSTATS Stats View
MISSIONIMPOSSIBLE Fast Monsters
STEVEAUSTIN Slo Motion On/Off