CheatCodes.com has all the official Rock Climbing 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 Tuesday May 21, 2013 for Rock Climbing are shown below.
Start a game and enter the item selection screen. Then, press Triangle, Square, Triangle, Square.
Start a game and enter the item selection screen. Then, press L1, L2, R1, L1(3), R1(2).
At the title screen, press R1, L1, R1, L1, R1, L1.
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