For all the codes below, they're to be done on the main menu while highlighting 'New Game':
Code Effect Press L, R, Right 13th Floor Level Hold L + R + Left Black Isle Level Hold L + R + Left Gallows Tree Level Hold L + R + Up Rome Level Hold L + R + Down Russian Base Level Hold L + R + Right Tower Block Level
Unlockable How to Unlock All Secrets In the game, go to the Inventory screen and select the Timex-TMX. On the Stats screen, hold Y until you get all 36 secrets.
Contributed By: Lagunathemoron.
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