
Metal Gear Acidメタルギア アシッド , stylized as METAL GEAR AC!D, is a turn-based collectible card 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.

Metal Gear Acid 2, is a turn-based collectible card stealth game developed by Kojima Productions and published by Konami for the PlayStation Portable in 2005. A Java ME version for mobile phones was released by Glu Mobile in 2008 titled Metal Gear Acid 2 Mobile.

Metal Gear Online was a stealth third-person shooter video game for the PlayStation 3. It was an online multiplayer spin-off of the Metal Gear video game series. The starter pack of Online was available worldwide bundled with Metal Gear Solid 4: Guns of the Patriots, with a standalone release for Japan. The name Metal Gear Online is common with earlier online components for Metal Gear Solid 3: Subsistence and Metal Gear Solid: Portable Ops. Metal Gear Online's North American and European servers were shut down on June 12, 2012.

Metal Gear Rising: Revengeance is a 2013 hack and slash game developed by PlatinumGames and published by Konami Digital Entertainment. Released for the PlayStation 3, Xbox 360, and Microsoft Windows, it is a spin-off in the Metal Gear series, and is set four years after the events of Metal Gear Solid 4: Guns of the Patriots. In the game, players control Raiden, a cyborg who confronts the private military company Desperado Enforcement, with the gameplay focusing on fighting enemies using a sword and other weapons to perform combos and counterattacks. Through the use of Blade Mode, Raiden can cut cyborgs in slow motion and steal parts stored in their bodies. The series' usual stealth elements are also optional to reduce combat.

Metal Gear Solid, released in Japan as Metal Gear: Ghost Babel, is a 2000 action-adventure stealth video game produced by Konami for the Game Boy Color. It was developed by Konami Computer Entertainment Japan after they were commissioned by Konami's European branch to develop a portable adaptation of their 1998 PlayStation game of the same title. However, the story of the Game Boy Color version is not a direct adaptation of the original PlayStation version, nor is it set in the mainline continuity, but instead it takes place in an alternative continuity set seven years after the events of the original Metal Gear (1987).

Metal Gear Solid Mobile is a mobile phone installment of the Metal Gear series first unveiled in Kojima Productions' 20th Anniversary party. The game was released worldwide. Konami offered the game as a paid download or pre-installed in a Metal Gear-branded cell phone. It shows Solid Snake in his attire from Metal Gear Solid 2: Sons of Liberty.

Metal Gear Solid Touch is a third-person shooter video game for iOS developed by Kojima Productions and published by Konami worldwide. Announced on December 16, 2008, Metal Gear Solid Touch is based on Metal Gear Solid 4: Guns of the Patriots. It was released on the App Store for select regions on March 18, 2009.

Metal Gear Solid: Portable Ops, officially abbreviated MPO, is a 2006 action-adventure stealth video game developed by Kojima Productions and published by Konami for the PlayStation Portable. The game was directed by Masahiro Yamamoto and written by Gakuto Mikumo, with series creator Hideo Kojima acting as producer.

Metal Gear Solid: Social Ops was a mobile entry in the Metal Gear stealth action video game series. It was released in Japan on December 6, 2012. The publisher Konami announced that the game would shut down on December 13, 2013.

Metal Gear Survive is a 2018 survival game developed by Konami Digital Entertainment and published by Konami. It was released worldwide for Microsoft Windows, PlayStation 4, and Xbox One in February. It is the first Metal Gear game to be developed following the series' creator Hideo Kojima's departure from Konami in late 2015, and the first since 1990's Snake's Revenge to be made without Kojima's input. The game takes place between the events of Metal Gear Solid V: Ground Zeroes and Metal Gear Solid V: The Phantom Pain, and follows the Captain, an MSF soldier who enters a parallel dimension and establishes a local command center to unravel the mysteries of a strange virus that turns people into zombie-like creatures.

Snake's Revenge is a stealth action-adventure video game produced by Konami for the Nintendo Entertainment System in 1990. It is a stand-alone sequel to Metal Gear that was released in North America and the PAL region following the international commercial success of the NES version. Much like the NES version of the first Metal Gear, the game was produced without the involvement of series creator Hideo Kojima, who went on to develop a separate sequel for the MSX2 titled Metal Gear 2: Solid Snake, which was released later during the same year in Japan.