At the title screen, highlight Start, enter L, R, L, R, A, B, A, B, X, Y, X, Y
Activates Weasel Mode and full Level Select in the Options screen. Also in the Options screen, Exit will be changed to Weasel
While the game is paused, Up, Down, Left, Right, X, B, Y, A
Invinciblity. Hold A and use the D-Pad to move anywhere in the level. Press Select to skip straight to the next stage.