Max energy increase
Get 6 cages to increase your maximum amount of energy. You can do this up to 10 times during the game.

Beat Lum Lord
When he shoots at you, jump and fly. When he is tired, power-up and shoot at him.

Bonus games
Link the Game Boy Advance to the GameCube version of Rayman 3: Hoodlum Havoc to unlock additional multi-player games.

Rayman 2-D Madness mini-game
Collect jewels during the game to get 1000 game points.

Racket Jump mini-game
Collect jewels during the game to get 3000 game points.

Crush mini-game
Collect jewels during the game to get 4000 game points.

Razzof Circus mini-game
Collect jewels during the game to get 6000 game points.

Rayman 2 reference
In the Hoodlum's factory, get to the place where you have to jump across crates to get to the other side. Once there, keep going up. You will eventually reach a location with a switch to activate the lifts to get to this second "conveyor belt". On those lifts, get pretty well up to the top. There is a hole in the side of a huge "pipe". Jump and helicopter over there and go in. You will see some of the villains from Rayman 2, including Admiral Razorbeard and his other cronies.