- Music Test: On the title screen, enter the Konami code (Up Up Down Down Left Right Left Right B A Select) and “Grassy Hills” should appear. Pressing left or right will change the track, pressing A will play it.
The following codes work wile playing a stage:
- Frog Suit (BAD LAD): B A Down Left A Down
- P-Wing (LUB DA DD): Left Up B Down A Down Down
- Invincibility (RUBBA DUB): Right Up B B A Down Up B
- 9900 Extra Coins (SARSLAB) : Select A Right Select Left A B
- Unlock World 8 + Unlock all locks (DD LUBS ALL): Press Down Down Left Up B Select A Left Left. A coin sound is played, and world 8 is accessible in the warp zone; you may need to reset the game.