Ninja Boy

Debug Mode
Game Genie code (Japan) or  (US) enables a debug mode after restarting the game and pressing Start. You will be taken to a level select, indicated by the number on the top-right of the screen. Pressing Start again will begin the selected level with 9 lives and much more inventory.

Level Select


The level select can also be accessed by pressing Up, Up, Down, Down, A, B, A, B on the title screen, then holding A and pressing Start.