Mega Man 4 Action Replay Codes (USA)
This page contains the Action Replay codes that I have available for Mega Man 4 (USA), a game for the original NES (Nintendo Entertainment System). If you're playing on an emulator, you'll typically be able to put these codes into the program through a built in option. Anyone who is really old school and playing on a physical console will have to purchase a physical Action Replay device to use these codes.
If you don't see the code you want on this page, I recommend you return to my Mega Man 4 Guides Index and choose a different section.
Infinite Lives: 00A1:09
Infinite Health: 00B0:9F
Untouchable: 003C:1F
Big Jump: 03D8:81
Use at your own risk, has drawbacks
Climb Anywhere: 0045:20
Enable it during the level. Turn off to use boss doors
Infinite Slide: 0034:10
Super Jump: 0041:60
You can't dismount ladders while this is on. Unless you use with the Climb Anywhere code.
Straight to Wily's Area: 00A9:FF
Title screen music modifier: 887A:??:12
Checkpoint Modifier: 001F:??
Infinite Time For Rush Coil: 0484:FE
No Enemies: C773:FF
Disable this code before facing bosses. It may also remove some needed platforms throughout levels
Robot Masters Have No Invulnerability Time: 05CF:00
Checkpoint Modifier - Always start at the beginning of the stage: 001F:00
Checkpoint Modifier - Always start at the halfway point of the stage: 001F:01
Checkpoint Modifier - Always start at just before the stage's boss: 001F:02
No Boss Health
Only turn this code on when the bosses health is fully loaded in
00BF:00
0467:00
Start At Second Group of Dr. Cossack Stages
00A9:FF
00AA:63