25 Tings
Pause game play and press R, Up, Left, Right, Left, L. This code can be repeated as needed.
99 lives
Pause the game and press A, Right, B, Up, A, Left, B, Down, A, Right, B, Up, A, Left.
All Electoons
Highlight a level at the map screen, then press Select + B + R, Select + B + R...