Stop Bombs
     At the Dam and Daily Planet, use Freeze Breath to stop the bombs.

Level Select
     After  getting the option to save your game, hit reset. Now go to
Load  Game  and  when it asks you to put in the rumble pak, hold L + B
for a few seconds and press A.

Infinite Powers
     At  the  Title  screen,  press  and hold A, B, C-Down, C-Up, then
press Start.

Level Skip
     At  the  Main Menu, press C-Up, C-Down, C-Left, C-Right, C-Right.
Begin a new game and press Start, C-Up, C-Down.