Various Cheats
At the consoles, go to the far left console, move the cursor to the left and right arrows and use Enter to scroll through the letters. After the letter is picked, move the cursor to Confirm and press Enter. After the code has been entered, move the cursor to OK and press Enter. If done correctly, you will hear a sound. Enter 'CHEATON' to enable cheat mode. Now enter any of the following "Codes":

OGGOK = All Inventory Items
ABRHAM21 = All Maps
MEMOK = Access All Memories
DRUUNA1 = Nude
DRUUNA0 = Normal Clothing
DRUUNA2 = Corset, Fishnet Stockings and Boots
DRUUNA3 = Lara Croft Costume
DRUUNA4 = Wonderwoman Costume
DRUUNA5 = Spiderman Costume
ZEROK = Zeros Stats to Avoid Maxing Out of Game
AP0-AP9 = Pass Levels
LUCEOK = Normal Light in Dark Level