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.
