Weird textures:
Press Down, A, Down, B, A, Y, X, X.
Rayman VMU icon:
Press Up, X, Y, Down, Y, X, Left, Right.
Hidden passage:
In Morb_20, press A, B, X, Y, X, Y.
Get Globox Disc accessin multiplayer:
At the main menu, hold L + R and press B, B, B, B.
Map bonus:
Just before the Access denied message, press A, B, X, Y, X, Y.
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Rayman 2: The Great Escape Cheats, Codes & Walkthrough/Guide/FAQ for Dreamcast from Cheat Code Central
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Rayman 2: The Great Escape Cheats at CheatingDome.com.