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.