Donkey Kong Land 3

Cheats

All levels complete:
  Press LEFT, LEFT, UP, DOWN, RIGHT, LEFT, LEFT, DOWN, UP, RIGHT, LEFT, LEFT,
  UP, DOWN, RIGHT. Open a saved game and all levels will be marked completed,
  with the exception of bonuses.

Unlimited lives:
  Press DOWN, DOWN, UP, LEFT, RIGHT at the title screen.
  Note: This code has no effect in time attack mode.

Sheepy Shop mini-game:
  Press UP, UP, DOWN, LEFT, RIGHT at the title screen. A sound will confirm
  correct code entry. Begin game play to start the Sheepy Shop card matching
  mini-game.

Leave previously completed levels:
  Pause game play, then press START + SELECT.