Mega Man IV

Mega Man IV is the fourth entry in the Game Boy Mega Man series. It's actually really good. It was also the last one to feature robot masters from the NES games.

Debug Menu


Use the Game Shark code 011A0ADF and select "Game Start". This should bring up the "Thank You For Playing" screen seen at the end of the game. From here, hit A or B to access the debug menu.

Be sure to disable the code once you've entered the menu.


 * TOAD-TOMS: Marks the appropriate boss as defeated and give you their weapon. Self-explanatory except for TOMS, which is Charge Man.
 * BLDA: Marks the Wily Tank stage as completed.
 * BKBA: Marks Ballade as defeated and gives you the Ballade Cracker weapon.
 * BEAT, WILY: Gives you the appropriate letter(s).
 * ME: Number of mini E-tanks. Every fourth mini tank gives you a full E-Tank.
 * WP: Number of Weapon Tanks (Max 4)
 * SP: Super Tank toggle.
 * EB: Energy Balancer toggle.
 * PC: Number of P-Chips. This value goes in fours, so the maximum value is 996.
 * ZA: Number of lives.
 * BKI: All weapons toggle. NL is OFF, and FL is ON. Note that this does not mark all of the bosses as defeated.
 * HERAZ: Unlimited Tanks toggle.
 * MUTEKIM: Invincibility variable. 00 turns this off. 01 will give you infinite energy, but you can still get hit, fall down pits, and get killed by spikes. 02 will give you infinite energy, disable all damage, and disable spikes. It will also turn all pits into bouncy surfaces! Just hold the A button to jump out.
 * CNTNUPT: Checkpoint variable. 00 is the start of the level, 01 is the midpoint, and 02 is the last checkpoint.
 * STAGED: Stage warp. Press Start to warp to the level of your choice. Note that you MUST warp to a level to keep any changes made with the debug menu.
 * 01: Toad Man.
 * 02: Bright Man.
 * 03: Pharaoh Man.
 * 04: Ring Man.
 * 05: Crystal Man.
 * 06: Napalm Man.
 * 07: Stone Man.
 * 08: Charge Man.
 * 09: Wily Tank.
 * 0A: Ballade.
 * 0B: Ballade -- Entrance.
 * 0C: Wily Spaceship -- Interior.
 * 0D: Wily Spaceship -- Teleport System.
 * 0E: Wily Capsule Fight.
 * 0F: Got Weapon screen.
 * 10: Dr. Light opening scene.
 * 11: Wily Tank destruction.
 * 12: Guard Satellite.
 * 13: Wily Spaceship -- Exterior.
 * 14: Wily Machine #4 cutscene.
 * 15: Wily Machine #4.
 * 16: Escape from Wily Spaceship.
 * 17: Wily Spaceship destruction.
 * 18: Robot Master demos.
 * 19: Thank You For Playing screen.
 * 1A: Debug intro.
 * 1B: Wily Spaceship -- Before Wily Machine #4.
 * 1C: Wily Tank attack.
 * 1D: Wily Saucer cutscene.
 * RECORD: Records a demo that can be played back later.



Select any stage from 01 to 09. Then, set record on REC, and press start. You should go to the boss recording room. If you die, beat the Robot Master, or press Start, the demo will stop recording. PLY will play back the demo of that level, if you've recorded one. HON will play the Robot Master demos seen at the end of the game.
 * SNDNO: Sound test.
 * EXIT: Exits the debug menu. This will discard any changes.

Miscellaneous Debug Text
The following text seems to be for debugging purposes, but it isn't actually used anywhere. Text starts at in the ROM.

Dr. Light Picture


Icons of Dr. Light talking and blinking are found with the rest of the Light Lab graphics. These should be used when he talks to Mega Man, but they aren't. They were probably cut to free up space in the dialogue box.

Early Stage Select Screens


More traditional stage select menu graphics exist in the ROM. These were replaced with the much cooler looking stage select seen in the final game. Mega Man III had a nearly identical selection layout.

The BEAT and WILY letters would appear over the stage icons after they were collected. Both of the Dr. Wily icons are taken directly from Mega Man III.

Unused Music
Four tracks are unused in the final game. These are all alternate versions of existing tracks.

Beat
A different version of the Beat acquisition music. It's pretty close to the final version.

Fortress Attack
An early version of the music used for the Wily Fortress attack cutscene.

Light Lab
Alternate version of the Dr. Light's Lab theme.

Wily Battle
Another version of the Wily Fortress boss music. Certain elements from this piece were used in the final version's theme.