Begin a new game and at the entrance door, type the code "120763- 090665". Hold 
the "CTRL" key and click "OK". Push "CTRL" and "0" and choose to not save the 
game. Open one of your old savegames; from this point, you can use one of the 
following Cheat Codes.

LOBBY
DRUM
HALL1
TAPESTRY
GARAGE
CHASM
DALI
ATTIC
CELLAR
VRROOM
JUNGLE

After you type a Cheat Code push the "ENTER" key to validate and you'll be 
transported directly into another area of the game.