Here are some cheats and tips for the game Mega Man 4.
01C-45F-915 Infinite lives
269-F6F-808 Start with 1/4 energy
4B9-F6F-808 Start with 1/2 energy
709-F6F-808 Start with 3/4 energy
001-CE9-3B7 Infinite energy
01C-AEF-E66 Start with 1 lives
05C-AEF-E66 Start with 5 lives
09C-AEF-E66 Start with 9 lives
21F-EAA-E61 Invincible
005-67B-A29 Shoot more than 3 shots at a time