Here are some cheats and tips for the game Mega Man 3.
02B-17F-E66 Start with 2 lives
06B-17F-E66 Start with 6 lives
09B-17F-E66 Start with 9 lives
00C-099-3B7 Infinite energy
009-77C-E6E Laser barriers appear and explode immediately on Sparkman stage
019-53C-F76 Takes 1 hit to kill Merciless Matt
0F9-53C-F76 Takes 15 hits to kill Merciless Matt