Rayman
2: Revolution
Cheat mode
Go to any map except the first and enter the options screen. Select "Sound", highlight the "Mute" option, then hold L1 + R1 and press L2, R2, L2, R2, L2, R2. A cheat menu will appear.
Secret multi-player maps
Go to the first map, then enter the options screen. Select "Language", then select "Voices". Highlight the "Raymanian" option, then hold L1 + R1 and press L2, R2, L2, R2, L2, R2. Three additional multi-player maps will be unlocked.
Baby Soccer secret map
While playing a game, hold L1 + R1 and press L2, R2, L2, R2, L2, R2.