Hiromi technical support helper:
Successfully complete the game in free mode without the ''Technical Support'' option.

Fifty lives:
Hold Select and press B, A, R(2), A, L at the game selection screen. A sound will confirm correct code entry. When you start the game, you will now have 50 lives.

In-game reset:
Press Start to pause game play, then press Select to exit the current level. Note: This can only be done in levels that have been previously completed.

Hero mode:
Successfully complete the game with a 100% rank. Start a new game and select two player mode to access the "Hero mode" option. In this mode, you play as Diddy Kong only, with a new costume. There are no Donkey Kong Barrels, Checkpoint Barrels, and pictures.

Hint: Get Diddy's or Donkey Kong's boat to move when fishing:
When fishing, get a combo. When you see the exclamation mark above Diddy's head, you can go somewhere and he will follow you. - This will help you catch more fish and get more combos.