Quick End:

At any point in the game, press Start to pause the game, then hold the Select button for two to three seconds.

 

Stage Select:

While playing the game, press Start to pause. You can use the following codes (with the L and R buttons) to jump ahead one level at a time. You can use these codes consecutively to go from Level 1 to Level 6.

Level 1 to Level 2:
R, L, R, R, L, L, R, L, R, R, L, L

Level 2 to Level 3:
R, L, R, R, L, L, R, R, R, L, R, R

Level 3 to Level 4:
L, R, L, L, R, R, L, L, L, L, R, R, R, L

Level 4 to Level 5:
R, R, R, L, L, L, R, R, L, L, R, L, R, L

Level 5 to Level 6:
R, L, R, L, L, L, R, R, L, L, R, L, R, L, L