While playing, pause the game and press C, A, Left, Left, A, C, A, B(CALL A CAB). You'll turn into a cursor and can go anywhere you like in the level. You can kill enemies by bumping them with the cursor, but you can't defeat the bosses this way. To return to normal, pause the game and enter the code again.

Note: If you try do this when you're a bomb you'll be invisible and invicible for the remainder of the level.