COIN (short for COunterINsurgency) is a series of multiplayer asymmetric strategy board wargames simulating historic insurgency and counter-insurgency conflicts and irregular warfares throughout the world. It is published by GMT Games.

This article may contain excessive or inappropriate references to self-published sources. (August 2022)

An example of COIN games is Cuba Libre, which is set in the Cuban Revolution during 1957-1958 and has the players take the role of factions struggling for control of Cuba. Another example is Pendragon: The Fall of Roman Britain, which simulates the decline of Roman Britain in the 5th century through the power struggle between the post-Roman army, Briton lords, and invading barbarians.

The series has been noted for its innovative and dynamic gameplay, compared to more traditional hex-and-counter two-player wargames.^[1] GMT Games publishes the games and releases new titles through its P500 system, and maintains several new COIN games in development pipeline at a given time.^[2]

Most of the published titles are available for playing through Vassal Engine modules.

COIN games simulate past and ongoing historical insurgencies and counter-insurgencies by pitting up to four players against each other. Each player controls a different faction with unique powers, resources, and play styles while striving to achieve different winning conditions. All games in the COIN series share the same underlying system designed by game designer Volko Ruhnke, first found in Andean Abyss, the original game of the series.

All of the games are playable solo. Non-player rules are included for players who wish to play by themselves, or for playing the game with less than the maximum amount of players. The non-player rules enables a non-player-controlled faction to participate in the game based on a predetermined set of actions.

This list describes all COIN games that have been published by GMT Games, and does not include both new games in development or fan-made ones.

• Andean Abyss

The first game of the series, designed by Volko Ruhnke and published in 2012. Andean Abyss is set in the 1990s Colombian conflict, and players can choose to play as the Colombian government, the insurgent FARC, the paramilitary AUC, or the drug-trafficking Cartels.

• Cuba Libre

Designed by Jeff Grossman and Volko Ruhnke and published in 2013. The game is set in the Cuban Revolution. Players pick a side from a selection of the incumbent Batista government, the 26th of July Movement, the students-led Directorio activists group, or the Mafia-run Syndicate. Cuba Libre is one of the lightest game of the COIN series in term of rule complexity, and is often promoted as the "gateway game" for newcomers to the genre.

• A Distant Plain

Designed by Brian Train and Volko Ruhnke and published in 2013. The game is set against the background of the modern Afghanistan conflict. The available factions include the Coalition forces, the pre-2021 Afghanistan government, the Islamist Taliban, and the narco-trafficking local Afghan warlords.

• Fire in the Lake

Designed by Mark Herman and Volko Ruhnke and published in 2014. The game is set in the Vietnam War. The available factions include the United States, the North Vietnamese Army, the ARVN, and the Viet Cong.

• Liberty or Death: The American Insurrection

Designed by Harold Buchanan and published in 2016. the game is set in the American war for independence. Players choose between the factions of the British Empire, the Patriots, the Indians, and the French.

• Falling Sky: The Gallic Revolt Against Caesar

Designed by Volko and Andrew Ruhnke and published in 2016. The game is set in the Roman conquest of Gaul. The game pits the Roman Republic led by Julius Caesar against the rivaling Gallic tribes of Arverni, Aedui, and the Belgae confederation of tribes. Falling Sky also includes the occasional player-controlled Germanic tribes fifth faction.

• Colonial Twilight: The French-Algerian War, 1954–62

Notably the only game in the series designed for 1–2 players. Designed by Brian Train and published in 2017. Taking a setting in the Algerian war for independence, players choose between the French colonial government and the Algerian FLN.

• Pendragon: The Fall of Roman Britain

Designed by Morgane Gouyon-Rety and Volko Ruhnke and published in 2017. Pendragon is set in the period of Roman Britain decline in the 5th century. The game simulates the power struggle between the post-Roman army (the Dux), Briton lords, and Gaelic and Germanic barbarians (represented as the Scotti and Saxons, respectively).

• Gandhi: The Decolonization of British India, 1917–1947

Designed by Bruce Mansfield and published in 2018. The game is set, as the title suggests, in the Indian independence movement portion led by Mahatma Gandhi. The game simulates four factions seeking to determine the fate of India: the British Raj, the Indian National Congress, the Muslim League, and Revolutionaries.

• All Bridges Burning: Red Revolt and White Guard in Finland, 1917–1918

Designed by VPJ Arponen and published in 2020. The game is set in the Finnish Civil War. The first COIN game designed for 1–3 players, it features the Whites, the Reds, and the Moderates. Two external forces are also represented: the German Empire and the Soviet Russia.

• The British Way: Counterinsurgency at the End of Empire

Designed by Stephen Rangazas and published in 2023. This is the first multi-pack COIN game, presenting four different two-player scenarios in different theaters during the era of British decolonialization. Each faces the British authorities off against a different insurgency:

• Palestine (1945-47) - set during the Jewish insurgency in Mandatory Palestine, the primary insurgent faction is the Irgun; the Hagannah are handled through an abstract faction-relations gauge.
• Malaya (1948-60) - set during the Malayan emergency against the Malayan Communist Party (MCP)
• Kenya (1952-60) - set during the Mau Mau Rebellion against the Kenya Land and Freedom Army (Mau Mau)
• Cyprus (1955-59) - set during the Cyprus emergency against the National Organisation of Cypriot Fighters (EOKA)

• People Power: Insurgency in the Philippines, 1981-1986

Designed by Kenneth Tee and published in 2023. The game is set during the run-up to the 1986 People Power Revolution in the Philippines. The game allows players to assume the role of one of three factions involved in the conflict: the Marcos government, the New People's Army, and the Reformers.