Ten continues:
Press Up, Down, Right, Left at the continue screen after there are less than three continues remaining.

Twenty lives:
Pause the game. Press and release A. Press and release Right + B. Press and release Left/Down + R. Press and release Y+C+Z. Twenty lives will be available when the game is resumed.

Ninety-nine lives:
Pause the game. Press and release Up. Press and hold X + B + Z (in that order), then release them in the same order. Press L(2). Hold Up + Y (in that order), then release them in the same order. Ninety-nine lives will be available when the game is resumed.

Energy recharge:
Pause the game. Press R, Left, Up, Right. Hold C + B (in that order), and release them in the same order. Hold R + L (in that order), then release them in the same order. Rayman's energy will return to full when game play is resumed.