Cheat Codes

At the title screen, press one of the following.
 

Effect                                                                                                      Code

Invulnerability                                                                                          B, B, B, A, B, Select, Select, B, A, A, Select, and Start.

Invulnerability and Level Select                                                              Select, B, Select, B, A, B, B, A, B, B, Select, Select, and Start.

Level Select                                                                                           Select, Select, A, B, B, Select, B, Select, A, and Start.

Refill your lifebar                                                                                    When you're low on life, pause the game, press and hold Select+A+B buttons, then

                                                                                                               while still holding them, unpause the game. You'll have a fully filled lifebar.