Mega Man X4, known as Rockman X4 (ロックマンX4 Rokkuman Ekkusu Fō) in Japan, and often shortened to MMX4, or just X4,[1] is the fourth game from the Mega Man X series. It was the second game in the series to be released on the Sega Saturn and Sony PlayStation (although it is the first original game; Mega Man X3 was ported to the systems), released in 1997 (and also re-released onto PlayStation as part of its greatest hits in 2002). It was later ported to the PC in 1998 and then re-released as part of the Mega Man X Collection.

Mega Man X4 was released on the Playstation Network in North America as part of the PSOne classics on September 2, 2014,[2] which was later released in Japan on December 17, 2014. It was then re-released on Mega Man X Legacy Collection on July 24, 2018 in North America and Europe, and was released two days later in Japan.

It is notable for being the first game in the X series to feature Zero as a completely separate playable character, with added emphasis on swordplay with his Z-Saber. It is also the second to feature animated FMV cutscenes (the first being Mega Man X3), but the first to have them fully-voiced.


In the year 21XX, two large Reploid armies currently exist to counter the Mavericks: The Maverick Hunters and the Repliforce. The two organizations cooperated on several occasions, and during this time Zero befriended Colonel and Iris of Repliforce.

But one day, the aerial city Sky Lagoon was attacked by Mavericks, who sabotaged its power generator, causing it to fall to the city below, killing thousands. As Repliforce was present in the area, they were put under suspicion and Colonel was asked that Repliforce surrender for questioning. Having great pride, Colonel refuses and leaves with his sister. Their leader, General, is indignant of the suspicion and starts a coup d'état to build a Reploid-only nation. Although General says they only want to live in peace, not wanting harm for the humans, the entire Repliforce is considered Mavericks, and the Maverick Hunters are sent to stop them, starting the Great Repliforce War. Little do they realize that behind the scenes, a mysterious cloaked figure pitted them against each other, in a bid to wipe out both sides.

Iris and Colonel.

During the war, Iris assists Zero while X is assisted by the rookie Double. After defeating several members of Repliforce, the Hunters fight Colonel and defeat him. Repliforce travels into space to begin their nation, and the Hunters chase after their satellite/space station. When playing as Zero, Iris is angered by her brother's death and fights him. The battle leaves her mortally wounded and she dies in Zero's arms. As X, it's revealed that Double was a spy of the cloaked figure and the two fight, resulting in Double's death; but not before insulting X for his naivety. The Hunters finally reach General and a battle ensues that leaves him severely wounded. Suddenly, the weapon in the station prepares to destroy Earth, and the cloaked figure is revealed to be Sigma. Sigma is destroyed by the Hunters, but the weapon can't be stopped by them. General sacrifices himself to stop the weapon, and the station explodes.

Upon leaving the battlefield, X and Zero contemplate the events and those who perpetrated the Great Repliforce War. Riding in escape ships to headquarters, X and Zero can only come to the same question: Deep down, will all Reploids eventually go Maverick on their own, by their own decision, one day, even themselves?


Mega Man X4 follows its predecessors as the player must combat Mavericks while traversing through obstacles and terrain. This is the second game to feature Zero as a selectable playable character, but the first game to feature him as a fully playable character (he had limited playability in the previous game). Unlike future games, players must play the entire game with the character they've chosen.

The playing styles of both characters differ from each other, giving the gamer a rather varied experience. Mega Man X still copies weapons through defeating bosses, utilizing the long range X-Buster. Zero however, learns techniques, which mimics an attack used by a boss, often with the use of his close-ranger Z-Saber, but none of these except his Giga Attack use Weapon Energy. Because of their gameplay differences, X is often recommended for novice to intermediate players since he can fight enemies from a distance while Zero is used for advanced players as he needs to get up and close to his targets.

The game is also the first to have actual multiple Armors in the game, as well as an "Armor" for Zero. X can find pieces for the Fourth Armor like he would any other armor in the previous games, enhancing his abilities further.

Finally, Mega Man X4 is the first X game to use cheat codes which unlock armors specific for the character selected. For X, he unlocks the Ultimate Armor (an enhanced version of the Fourth Armor), which first starts out replacing X's cyan colors with purple. When X visits any of the Light Capsules, he is automatically equipped with the full Ultimate set, giving him a Plasma Shot upgrade and the Nova Strike Giga Attack as well as enhanced defense and the ability to hover in the air (these abilities were also featured in the Fourth Armor, although the latter's use of the Nova Strike is limited). Zero on the other hand gets the Black Zero armor, which gives him a black sheen and platinum blond hair, but does not affect his abilities in the least. The codes for unlocking these armors differ on the consoles.


Stage select screen

Opening Stage boss:

Stage Select Screen bosses:

Stage Boss Weapon Weakness
X Zero X Zero
Jungle Web Spider Lightning Web Raijingeki Twin Slasher Shippuuga
Bio Laboratory Split Mushroom Soul Body Kuuenbu and Kuuenzan Lightning Web Raijingeki
Cyber Space Cyber Peacock Aiming Laser Rakuhouha Soul Body Ryuenjin
Air Force Storm Owl Double Cyclone Tenkuuha Aiming Laser Rakuhouha
Volcano Magma Dragoon Rising Fire Ryuenjin Double Cyclone Raijingeki
Snow Base Frost Walrus Frost Tower Hyouretsuzan Rising Fire Ryuenjin
Marine Base Jet Stingray Ground Hunter Hienkyaku Frost Tower Hyouretsuzan
Military Train Slash Beast Twin Slasher Shippuuga Ground Hunter Raijingeki

Memorial Hall and Space Port boss:

Final Weapon bosses:

  1. Double (if X) or Iris (if Zero)
  2. General
  3. Rematches and Sigma

Armor Parts

Main article: Fourth Armor
  • Head Parts: In Cyber Peacock's stage. Gives X unlimited Weapon Energy for uncharged Special Weapons, and reduced Weapon Energy usage for charged ones.
  • Body Parts: In Magma Dragoon's stage. Usually reduces damage taken by around 33% (exact amount varies depending on the attack), lessens knockback, and allows X to use a Giga Attack, the Nova Strike. It is a rushing, invincible, damage-inducing attack, with limited energy. that restores over time. Damage taken is absorbed to replenish the Nova Strike's energy.
    • Damage Reduction: 9 Damage → 6, 6-8 Damage → 4, 3-5 Damage → 2, 1-2 Damage → 1.
  • Arm Parts: In Storm Owl's stage. There are two options for the Arm Parts; both allow X to charge Special Weapons in addition to another ability:
    • Stock Charge Shot: Allows X to charge up four Charge Shots at once. Four icons appear next to X's life gauge to keep track of the number of shots stored. Whenever X fires while an icon is visible, he will fire a Charge Shot. The equipped parts have white arms and blue fists. The only drawback to this part is that the charged shots are smaller in size.
    • Plasma Charge Shot: Upgrades X's second-level Charge Shot to the Plasma Shot. This shot is much larger and more powerful than the standard blast, and will leave up to three plasma balls generated to cause continuous damage. The equipped parts have black arms and red fists. The main drawback to this part is that the plasma balls left behind take priority in dealing damage, meaning that if X fires a Charge Shot and then use another attack afterwards, the damage will be ignored due to the plasma ball.
  • Foot Parts: In Web Spider's stage. Allows X to dash or hover midair. He can move left or right while hovering, but the amount of time airborne reduces if so.


  • Ultimate Armor - A special armor that is even stronger than X's Fourth Armor. It possesses all of the powers of the Fourth Armor (using the Plasma Charge Shot, not the Stock Charge Shot) and has unlimited energy for the Nova Strike. Obtainable by inputting a secret code on the Title Screen before starting X's story, then entering any of the game's Light Capsules.
  • Black Zero - An aesthetic change to Zero that colors his armor black. Obtainable by inputting a secret code on the Title Screen before starting Zero's story.


Main article: Mega Man X4/Gallery

See also

Mega Man X4 title screen.



Stage select screen (mobile phone version)

  • Like Mega Man 8, X4 has been a target of ridicule due to its sub-par voice-acting, including X being voiced by the same actress who portrayed Mega Man in 8, which received similar criticism, as well as Zero shouting "What am I fighting for?" when Iris dies. This game was also the first in the series to utilize a dialogue sequence between the Hunters and the Mavericks instead of going straight to the battle. This would carry on for the rest of the series.
    • Similar to Mega Man 8, the game's bosses would give a voiced line of dialogue just before the battle began, as well as reactions to being attacked during the battles. Unlike Mega Man 8 however, these were not translated for Mega Man X4's western release, and simply removed from the game with the exception of Magma Dragoon's dialogue during battle.
  • It is not known which ending in this game is canon: X's or Zero's. This stems from the fact that both Zero's battle with Colonel and X's battle with General are referenced by Spiral Pegasus in Mega Man X5, and also images of Zero battling Colonel and X fighting Double in the opening. It is most likely a combination of both endings.
  • This is the first game to show official names for an armor; ironically, it is for the secret Ultimate Armor.
  • It should be noted that this is the debut of the Ultimate Armor and Black Zero as unlockables.
  • Although there are two more games in the X series in which the final boss is fought in three battles (Mega Man X and Mega Man X8), X4 is the only game where the player fights Sigma in all three phases.
    • X4 is also the only game in which Sigma uses two forms alternately in one battle, which is the case for the final phase of the boss battle.
  • X expresses fear in the ending that he himself may become Maverick. He requests to Zero that, should he ever exhibit symptoms of him becoming a Maverick, that he is to "take care of him".
    • The ending monologue in X's story also seems to implicate foreshadowing that he may become a Maverick in the future as well, hinting his original intended role in the first Mega Man Zero game, which was changed to be Copy X.
  • Chill Penguin and Blizzard Buffalo make cameo appearances in the background of Frost Walrus' stage. Buffalo was killed and frozen by Frost Walrus in Yoshihiro Iwamoto's Rockman X4 manga.
  • This game marks the first time that a "Warning" signal is used when a boss is about to be fought.
  • On a few occasions, the game may become stuck on a "Warning" signal on the PlayStation version, forcing the player to have to reset the game. This glitch also occurs in Mega Man X5.
  • Unlike Mega Man 8, the Sega Saturn version features no major differences from the PlayStation version. Some of the graphical effects were dithered on the Saturn hardware, such as the searchlights in the first part of the intro stage. Despite the slight downgrades, there are some exclusive enhancements such as seamless track looping, as well as a cresendo at the beginning of the music for the Frost Walrus stage and the intro stage boss. There is also a heat wave effect in the background of the ground portion of the intro stage and Magma Dragoon's domain.
  • On the PC version, the music for the final battle with Sigma was switched around. In other words, the music that played for the first phase of the battle on the Saturn and PlayStation versions became the final phase in the PC version and vice-versa. This can be easily fixed, if one goes into the game's "BGM" folder, and swaps the names of "BGM01.SE" and "BGM02.SE" around. In fact, the game uses regular wave audio files (renamed with a ".SE" extension), so, any music that the player wants to hear can be placed anywhere throughout the game, as long as it's in .wav format, by simply renaming any desired wav files with the appropriate BGMXX.SE title and placing it in the BGM folder, making sure to back up the original files. Mega Man X3 and X5 on the PC works in the same manner.
  • X's eyes appear blue in the anime cutscenes, where canonically they are green. On the flip side, Zero's eyes are green in the cutscenes while they are canonically blue for the most part.
  • In the 1st Sigma battle during "Round 2", it is possible to stand right behind Sigma as he uses his eye lasers on the floor, allowing a number of free hits until the attack ends. This is easier to attempt as Zero.
  • The crossover game Project X Zone features X and Zero as playable allies. Some of their Special Weapons and techniques are from Mega Man X4 and previous games. Certain events in Project X Zone suggest that the game's plot occurred some months after the Repliforce incident.[3]
  • In this game, only three of the eight stage bosses have their health bars display Sigma's symbol on their bottom instead of the Repliforce emblem. They are Magma Dragoon, Split Mushroom and Cyber Peacock. The other five, as well as the rest of the Repliforce, are just revolting for having been deemed Mavericks (or in the case of Frost Walrus, simply for the sake of it).
    • Mid-bosses have their own health bar in this game, with skull symbol under it.
  • The Windows version added an additional easy mode but the only noticeable difference is the player's damage received from enemies being halved in easy mode. This easy mode is only present in Windows version of this game.
    • The Windows version also added an additional music test mode which is not available in other versions.
    • Coincidentally the later release of Mega Man X Legacy Collection would have a number of similar feature for both easier gameplay and a music player.
  • In Japan, the game was released in two versions for mobile phones, one having X's story and the other Zero's story.
  • This is the only X series game where it is impossible for Zero's defense to be raised due to his inability to acquire body armor like X. Later X games would fix this issue in allowing Zero's defense to be raised like X's.
  • This game shows blood in Zero's story, but its just the oil colored red and is not actually blood.

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