We have 2 cheats and tips on GameBoy. If you have any cheats or tips for Ninja Boy please send them in here. You can also ask your question on our Ninja Boy Questions & Answers page.
At the 'Title' Screen press Up, Up, Down, Down, A, B, A, B, A, A, B, Start to view the ending.
Enter the following codes for the corresponding cheat at the Tonight's Match Up screen
Extra Continue
At the game over screen hold down the A button and press start to continue your game.