At the entrance door, type 120763-090665, then hold CTRL and hit OK. Press CRTL+0, but make sure you don't save. Then open an existing save and type in one of the following codes, then press ENTER to go to that area.
LOBBY
DRUM
HALL1
TAPESTRY
GARAGE
CHASM
DALI
ATTIC
CELLAR
VRROOM
JUNGLE