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Metal Gear Acid
Metal Gear Acid Coverart.png
Developer(s)Konami Computer Entertainment Japan
Director(s)Shinta Nojiri
Designer(s)Shinta Nojiri
Artist(s)Tsubasa Masao
  • Moku Tochibori
  • Shuyo Murata
  • Tomokazu Fukushima
  • Nobuko Toda
  • Shuichi Kobori
  • Akihiro Honda
SeriesMetal Gear
ReleasePlayStation Portable
  • JP: December 16, 2004
  • NA: March 22, 2005
  • EU: September 1, 2005
Mobile phone
  • EU: March 10, 2008
Genre(s)Tactical role-playing, stealth, digital collectible card game
Mode(s)Single-player, multiplayer

Metal Gear Acidメタルギア アシッド (Metaru Gia Ashiddo), stylized as METAL GEAR AC!D, is a turn-based collectible card[1] tactical RPG video game developed by Konami Computer Entertainment Japan for the PlayStation Portable. The game was first unveiled at E3 in May 2004, and was released in Japan on December 16, 2004, in North America on March 22, 2005, and in Europe on September 1, 2005. It was the first game in the Metal Gear series for the PSP. A Java ME version for mobile phones was released by Glu Mobile in 2008 titled Metal Gear Acid Mobile.[2]

Acid focuses on turn-based tactics, using a trading card-based system to control the main character's movements and actions. Acid in the name stands for "Active Command Intelligence Duel". The cards are not truly collectible, as the game is complete with a single purchase. However, the game does feature deck design and deck optimization elements. The game allows for multiplayer gameplay by wireless ad-hoc connections of two PSPs.


Before each round, the player can customize the deck of cards used by the main characters. The majority of the cards are based upon elements spanning the entire Metal Gear series, such as weaponry, characters, and even the Metal Gear itself. When the game is started, the player's hand can consist of a maximum of six cards. The maximum number of cards in a deck increases with overall progress. In action mode, the player can choose to use the cards as they are intended or use them to move the character. Most cards only allow the player to move three spaces, while certain cards let the player move up to six or higher.

Cost is an important factor in game play and can be summed up as the weight of the player's action. With some exceptions, all cards have a cost attached to them and when used this cost transfers to the player. Cost varies radically from card to card. The higher the cost a character has, the longer that character must wait until their next turn. The lower the cost a character has, the shorter that character must wait until their next turn. For example: if a player character has a cost of 10 and a guard has a cost of 15, then the character's turn would occur before the guard's.

Some cards can be equipped; cards such as weapon cards, can have other cards attached to them in order to improve performance. In order to fire the weapon, another weapon card that uses the same kind of ammunition must be equipped. Some weapons don't need to be equipped and can be used by themselves, however they are discarded afterwards. Other cards that can be equipped include equipment cards and action cards.

Multiplayer, or "Link Battle", is also a new feature. Two PSP systems running Acid can link wirelessly, allowing players to face each other in a "sneak-off". The objective is to collect a certain number of diskettes before the rival player. Diskettes can be stolen by another player, so there is an emphasis on avoiding detection.



In 2016, a jumbo jet carrying Senator Hach, an important politician and likely future presidential candidate, is hijacked by terrorists. In exchange for the senator the terrorists demand from the United States government Pythagoras, a research project being conducted in the Moloni Republic in southern Africa. In efforts to identify these terrorists, the government begins an investigation of Pythagoras.

The Moloni government refuses to cooperate and work with the United States, saying that it doesn't want to interfere in its current affairs. In response, the US sends in a covert special forces team to investigate, but the team is obliterated by armed resistance. With no other options and time running out, the US government calls Solid Snake to infiltrate the laboratory, discover the nature of Pythagoras, and to rescue Senator Hach.


Production and release

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According to an interview originally published by Electronic Gaming Monthly with the game's producer, Masahiro Hinami, the 'Acid' part of the title actually has three different meanings. The first meaning refers to Acid's departure from the previous Metal Gear games in terms of style, which is an analogue to acid's ability to dissolve metal. The second is a reference to vecuronium bromide, the chemical used by Elsie and Frances to hijack Flight 326. The third is stated to be an acronym for Active Command Intelligence Duel, a reference to the game's mixture of turn-based tactics with card-based gameplay.[3]


The game's soundtrack was composed by Nobuko Toda, Shuichi Kobori and Akihiro Honda. The soundtrack was released on December 21, 2005, packaged with the Metal Gear Acid 2 soundtrack. The album's title is Metal Gear Acid 1 and 2 Original Soundtrack.


Metal Gear Acid received generally positive reviews from critics. The game holds a 75 on Metacritic, indicating "generally favorable reviews".[4]


Acid was followed by a sequel for the PSP, Metal Gear Acid 2, which released the following year. A mobile phone version, titled Metal Gear Acid Mobile was also produced.



  1. ^ "GameSpy: Metal Gear Acid Review".
  2. ^ "Metal Gear Acid Mobile - Konami Europe". Archived from the original on 2010-05-11.
  3. ^ "Metal Gear Acid Preview from". Archived from the original on 2012-07-08.
  4. ^ "Metal Gear Acid". Metacritic. Retrieved 13 July 2014.