We have 2 cheats and tips on GameBoy. If you have any cheats or tips for Ninja Boy 2 please send them in here. You can also ask your question on our Ninja Boy 2 Questions & Answers page.
To collect everything when you leave the Mecha town and board the the comet to be able to enter the last stage (Graviton) enter the password MZZ665 (Triangle) N4 (Cross) 4 (Triangle) XYCKB5 (Cross) TP6JF TD (Circle) G
At the 'Password' screen enter 'Three Musical Notes' to enable the Music Test.