Metal Slug Wiki
Metal Slug Wiki

Metal Slug 6 (メタルスラッグ 6) is a run and gun video game for the Sammy Atomiswave arcade platform released in 2006. It was the first main game in the franchise not to run on SNK's Neo Geo MVS arcade hardware. This game, alongside Metal Slug 3D, were created as commemoration for the series' 10th anniversary.

There was a PS2 port in September 14, 2006. It is also featured in Metal Slug Anthology for the Wii, PlayStation 2, and PlayStation Portable, and Metal Slug Complete PC for the PC.


From the Metal Slug Anthology manual:

A farewell to arms—it was all supposed to have finished with that final battle. Morden’s third attempt at world conquest was over. But his whereabouts still remain unknown. But even with the remnants of Morden’s army neutralized, our heroes’ requests for discharge from the service were still refused.

For a brief moment there was peace, but the frequent chatter of late, intercepted by the expanded and consolidated Division of Intel, suggests this peace will not last long. Recent intel includes testimonials from people who have seen UFOs, aliens, and giant creatures. Fortunately, there have been no reports of damage or injury, but one can’t help feeling the Mars People, or maybe even Morden, are behind all of this. And finally intelligence officers acquired conclusive proof:

A group resembling Morden’s army hid themselves in a mountainous region and were gathering weapons and building installations. Yet there were still doubts: General Morden’s army was nowhere to be seen. The objectives of the group were unclear, and whether this group was in fact Morden’s army remained inconclusive. Although it was concluded that this could not be a military group by any standard, those at HQ, particularly sensitive to anything concerning Morden, however, quickly summoned the usual four: Marco and Tarma from P.F. Squad and Eri and Fio from S.P.A.R.R.O.W.S.

Only moments away from deployment, no one attempted to voice their opinions. They stood face to face with two new but yet somehow familiar faces ready to join their team. “It’s not that we don’t trust the four of you,” the commander spoke, “but word from the top dictates that you’ll be working with these two private contractors for this operation.”

“Ralf Jones here. Let’s get this baby done!”

“Clark Still. It will be my honor if I can be of assistance to all of you.”

With their newly furnished weapons in hand, this new team began their parachute drop into hell.

This is the last time!

Metal Slug 6 returns to the Rebel-Martian alliance featured in Metal Slug 2/X and Metal Slug 3, but on a much broader scale. Rather than repeating the previous games' events of the Martians breaking the alliance and the Rebels assisting the player in turn, the player now teams up with the Rebels and Martians to combat an even greater threat.

In the series timeline, Metal Slug 6 takes place after the events of Metal Slug 3. The latter game's antagonist, Rootmars, was in the middle of being rescued from the ocean's depths before the Invaders attacked.

The game has two different endings depending on the route taken in Mission 4. Morden rescues the player for the top path, and Rootmars rescues the player for the bottom path.


There are now two modes of play the player can choose from right at the beginning: Easy and Hard.

  • Easy Mode lowers the difficulty of the game and changes the player's default weapon to the Heavy Machine Gun (that, like the pistol it replaces, has infinite ammo); however, the game ends just before the fifth and final mission. Also, when one continues after dying, a grenade crate appears instead of the Heavy Machine Gun.
  • Hard Mode acts like the previous games except it halves ammunition for all special weapons sans grenades.

New techniques are now present as well, activated through certain button combinations. A secondary melee attack is also available. Conversely, the sliding technique from Metal Slug 5 has been removed.

Metal Slug 6 introduces a new play mechanic dubbed the Weapon Stock System. Two gun power-ups can now be carried at the same time. Players can switch between the two weapons, or simply put them both away in favor of the default weapon. When obtaining a new weapon power-up, it will automatically occupy the inactive slot (or, if both are holstered, replace the less recent weapon of the two). Characters can also throw away one gun power-up's worth of ammunition to give to the other player or simply discard altogether.

The game's second new mechanic is a combo system called the Rush Blaster System, where the score is multiplied by powers of 2. The faster the speed at which enemies are killed, the higher the power, as a meter at the bottom of the screen shows. When it says "Max" (x16), enemies and destructible objects will drop coins for an extra high score.


Below are the default controls for the game. The PlayStation 2 standalone release allows the Vulcan Fix to be used by all characters; it is turned off by default.

On Foot

PS2 Standalone
A Square Shoot
B X Jump
C Triangle Grenade
D+A R2
Alternate Melee
D+C L1 Toss Weapon
Up+D+A Up+R2
Ralf: Vulcan Punch
Clark: Super Argentine Backbreaker
E Circle Switch Weapon


PS2 Standalone
A Square Shoot
B X Jump
Down+B Down+X Exit Slug
C Triangle Cannon
Down+C Down+Triangle Grenade
D R1 Metal Slug Attack
E Circle Switch Weapon


The number of playable characters has expanded for the first time since Metal Slug 2; the original team of Marco Rossi, Tarma Roving, Eri Kasamoto and Fio Germi is joined by newcomers Ralf Jones and Clark Still of King of Fighters and Ikari Warriors fame.

As a series first, each playable character now possesses his or her own unique attributes. The amount of ammunition received from weapons, defensive ability of vehicles, and melee speed vary from person to person, each of whom possess a special ability:

  • Marco: His default weapon (Pistol on Hard, Heavy Machine Gun on Easy) has twice the ordinary strength. Fio is his savior if he is brainwashed.
  • Tarma: While riding in or on a Slug, durability and the effects of power-ups are doubled; additionally, the Vulcan cannon's power is increased by 50%. He also is capable of using Vulcan Fix when on or in any vehicle. Eri is his savior if he is brainwashed.
  • Fio: Begins each mission with the Heavy Machine Gun in the Weapon Stock (on Easy mode, she begins with the Big Heavy Machine Gun by default). Weapon supply is also increased by 50%. Marco and Ralf are her saviors if she is brainwashed.
  • Eri: Receives twice as many grenades upon starting or resupplying. She can aim her throws in specific directions, including upwards and downwards, and at varying distances. Tarma and Clark are her saviors if she is brainwashed.
  • Ralf: Melee attack speed is doubled, at the expense of weapon and grenade supplies being halved. He can also use the special Vulcan Punch attack, melee strikes capable of damaging vehicles. Can take two hits from most attacks before losing a life. Lastly, he is the only character able to damage vehicles and larger enemies with his melee attacks.
  • Clark: He can perform his Super Argentine Backbreaker against most non-vehicle enemies. Using it on a vulnerable target grants him temporary invincibility during and after the move, while earning generous amounts of points that increase with each additional enemy thrown.

The brainwashed character serves as the mid-boss in the final mission depends on the character Player 1's chosen. This character is unselectable during the whole mission even when they're rescued.

New Slugs

The SV-001, SV-001 Type-R and Slug Flyer make an appearance in the game, as well as some new ones:

  • Donkey Slug: A donkey with a mounted Vulcan cannon. Like all animal slugs, the donkey provides no protection to the rider. The Donkey Slug can acquire a two-wheeled out-house cart mounted with a Metal Slug cannon for extra firepower without using grenades.
  • Slug Digger: A multi-purpose subterranean digger as well as a helicopter. It has retractable drills on the left, right, and bottom sides, which are used to drill into the earth, and sports two Vulcan cannons, which can also be used to drill through the dirt. The players cannot get out of the Slug, neither can they perform the Metal Slug Attack with it. If the Slug Digger is destroyed, the player is killed. It is also armed with proximity mines.
  • Protogunner: The Slug Gunner from Metal Slug 5 in its development phase. It has no melee attack, it does not have tank mode, and the player is exposed to enemy attacks. Its Vulcan cannon is more like that of the SV-001. It has a built-in Vulcan Fix that any character can use.
  • Rootmars: When taking an alternate route in Mission 4, Rootmars swoops in and picks up the player characters to their next destination. Rootmars' electric brainwave is useful for eradicating through hordes of enemies. It also has two Vulcans with a Vulcan Fix, each one controlled by a separate player.


All special weapons return in this game including Fire Bombs. New to this entry is the Zantetsu "Z" Sword, which augments the player's melee weapon attack with lethal shock waves capable of neutralizing enemy fire.

It is noted that weapon ammunition for both difficulty modes has been reduced compared to previous installments.

Weapon MS1-MS5 Metal Slug 6
Easy Mode Hard Mode
Others Fio Ralf Others Fio Ralf
Heavy Machine Gun 200 100 150 50
Rocket Launcher 30 20 30 10 10 15 5
Shotgun 30 20 30 10 10 15 5
Flame Shot 30 20 30 10 10 15 5
Laser Gun 200 200 300 100 100 150 50
Enemy Chaser 40 20 30 10 10 15 5
Iron Lizard 30 20 30 10 10 15 5
Drop Shot 30 20 30 10 10 15 5
Super Grenade 20 20 30 10 10 15 5
Two Machine Guns 200 (MS4)
300 (MS5)
400 600 200 200 300 100
Zantetsu Sword N/A 20 30 10 10 15 5

Missions and Bosses

Mission names are based on the mission's first section title according to its debug menu[1].

Stage Name Boss BGM
1 African Winds Bull Drill Main Theme from MS6
Cliff and Cave
2 The Illusion of El Dorado Iron Sentinel Inner Goldfield
3 Asian Impact Brain Robot Asian Impact
4 Golden Bridge is Falling Down Elder Centipede Bridge 256
Aim High Chase Fast
5 Ancient Law Controller (Miniboss)
Invader King (Final Boss)
Final Attack [MS6 Version]


The Japan-only PlayStation 2 version of Metal Slug 6 comes with extra features:

  • Art Gallery - Concept Art of Metal Slug: Super Vehicle-001 to Metal Slug 6.
  • Sound Gallery - Music from Metal Slug: Super Vehicle-001 to Metal Slug 6.
  • Game Options - Including secondary difficulty (as in the Neo Geo games), lives, and violence setting. Two cheats can also be unlocked: infinite ammunition and infinite bombs.
  • Combat School - A modified version of Arcade Mode where skills are tested by completing missions under certain objectives.
  • Records - A trophies page and a prisoners page showing items and people collected and rescued.

Metal Slug Anthology (named Metal Slug Complete or Metal Slug Collection in some regions) has the arcade Metal Slug 6 included on the disc alongside a few pieces of concept art. Unlike the other games in the compilation, Metal Slug 6 limits the players with 15 continues.


  • Metal Slug 6 is the first game to feature three factions working together to repel or defeat another faction. In this case, the Regular Army, Rebel Army and Mars People against the Invaders.
  • Metal Slug 6 is the first in the main series to feature the characters with their own unique attributes. Prior to this, Metal Slug 4 had Nadia and Trevor use different melee weapons, and Metal Slug: 2nd Mission had Gimlet and Red Eye travel through different paths and had their own exclusive guns.
  • Metal Slug 6 is the first installment since Metal Slug 2 to increase the number of playable characters.
  • This is the first game in the main series since Metal Slug to be devoid of transformations.
  • The Invaders originally did not had a definitive name, so fans nicknamed them the "Venusians" until their names were officially revealed in Metal Slug Defense.
    • Like with the Invaders, the Elder Centipede also originally did not had a definitive name, so fans nicknamed it the "Sea Worm" (based on its concept art label) until its name was officially revealed in Metal Slug Attack.

External links


Flyers and Covers


  1. Ragey0 and candy76041820. "Metal Slug 6 Missing Areas". Metal Slug: Missing in Action.
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Metal Slug 6
Heroes Marco Rossi | Tarma Roving | Eri Kasamoto | Fio Germi | Ralf Jones | Clark Still
NPCs Riviera von Wittenberg | Maryell von Wittenberg | POW | Rumi Aikawa | Madoka Aikawa | Hyakutaro Ichimonji | Donald Morden | Rebel Army | Chinese Soldier | Martians | Rootmars | Invaders | Announcer | Duke Koudou | Pupipi
Enemies Fanatics | Grenade Soldier | Bazooka Soldier | Shielded Soldier | Rebel Rifleman | Mortar | Gatling Soldier | Hunters | Mars People | Mini-UFO | Invader Squad | Winged Invader | Flying Parasite | Hunter Walker | Giant Hunter Walker | Space Mole Cricket | Crab-Tank | Vanguard | Smasher | Invader UFO | Flying Shelt | Flying Core | Flying Killer | Maggot
Enemy Vehicles Di-Cokka | T-2B Melty Honey | MV-280C | Nop-03 Sarubia | Girida-O | M-15A Bradley | 3-ton Utility Truck | Walking Locomotive | R-Shobu | MH-6S Masknell
Bosses Bull Drill | Iron Sentinel | Brain Robot | Elder Centipede | Invader King


Weapons Heavy Machine Gun | Rocket Launcher | Shotgun | Flame Shot | Enemy Chaser | Iron Lizard | Super Grenade | Drop Shot | Two Machine Guns | Zantetsu Sword | Grenade | Fire Bomb
Slugs SV-001 (Type-R) | Slug Flyer | Donkey Slug | Protogunner | Rootmars Slug | Slug Digger
Missions "African Winds" | "The Illusion of El Dorado" | "Asian Impact" | "Golden Bridge is Falling Down" | "Ancient Law"
Other Combat School | Weapon Stock | Rush Blaster System
Metal Slug Series
Main Series Metal Slug: Super Vehicle-001 | Metal Slug 2/(X) | Metal Slug 3 | Metal Slug 4 | Metal Slug 5 | Metal Slug 6 | Metal Slug 7/(XX)
Spin-Offs Metal Slug: 1st Mission | Metal Slug: 2nd Mission | Metal Slug Advance | Metal Slug 3D | Metal Slug Tactics
Tower Defense Metal Slug Defense | Metal Slug Attack | Metal Slug Infinity
Mobile Metal Slug Mobile | Metal Slug Mobile Impact | Metal Slug: Allen's Battle Chronicles (Mobile 3) | Metal Slug Mobile 4 (UMS: Login) | Metal Slug Soldiers (UMS: Tank Conspiracy) | Metal Slug Fighters (UMS: Fierce Battle) | Metal Slug Warriors (UMS: Triumph) | Metal Slug STG | Metal Slug Mars Panic! | Metal Slug Tactics | Metal Slug M1 | Metal Slug M2 | Metal Slug 2013 | Metal Slug Team Mission | Metal Slug: Awakening | Metal Slug: Commander
Pachinkos Metal Slug Type-A | Metal Slug SV-001 | Metal Slug 3 (Pachinko)
Compilations Metal Slug 4&5 | Metal Slug Anthology | Metal Slug Complete PC | Arcade Archives | Neo Geo Pocket Color Selection
Cancelled / Discontinued Metal Slug (GBA) | Metal Slug Zero Online | Metal Slug Touch | Metal Slug Revolution | Metal Slug Wars | Metal Slug XX Online
Prototypes Metal Slug Advance
Related Titles
Cameos / Crossovers The King of Fighters '99 | SNK vs. Capcom: The Match of the Millennium | The King of Fighters 2000 | SNK Vs. Capcom: CHAOS | Neo-Geo Battle Coliseum | The King of Fighters: Maximum Impact 2 | SNK Vs. Capcom: Card Fighters Clash | SNK Vs. Capcom: Card Fighters DS | Days of Memories 2 | Neo Geo Heroes: Ultimate Shooting! | Battle Cats | RPG! Sister Quest | Jetpack Joyride | The King of Fighters XV
Ikari Warriors Ikari Warriors | Victory Road | Ikari III: The Rescue | Ikari: Leona Gekitohen
Irem Games
Irem's D.A.S. Universe

Air Duel | Undercover Cops | In The Hunt | Gunforce II

Books Metal Slug: The Ultimate History | Metal Slug Attack Official Artbook