CheatCodes.com has all the official Underground CD Vol. 1-1 PSX cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Friday May 24, 2013 for Underground CD Vol. 1-1 are shown below.
At the main menu of Disc 2, hold Square + Triangle + Circle and press L1.
At the "In Stores Now" screen of Disc 2, hold L1 + R1 + L2 + R2 (in that order), release the buttons, then press L1 + L2 + R1 + R2.
At the "Coming Soon" screen of Disc 2, hold Square + Triangle + Circle, then press X.
At the "Coming Soon" screen of Disc 2, press Square, Triangle, Circle, Triangle, Square.
At the main menu of Disc 1, press Square, Triangle, Circle, X.
At the "Download Station" screen of Disc 1, highlight the "Options Menu" selection. Then, hold R1 + L1 + R2 + L2 (in that sequence) and press Square.
At the "Vault" screen of Disc 1 press, Circle, Triangle, Square.
At the "Code Book" screen of Disc 1, press Triangle(3).
At the "Behind the Scenes" screen of Disc 1, hold L1 + L2 + R1 + R2.
At the "Tech Q & A" screen of Disc 1, press Square, Triangle, Circle.
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