Have access to the most difficult levels
  Turn on the GB, hold DOWN and keep pressing START until the Options screen
  appears. Select the type of game (A or B) e select the level. Next to the
  selected level will appear a heart. It indicate that the level is 10 levels
  up (if you choose level 10 you will be playing in level 20)

Cheats von Camilo (camilolc@uol.com.br)