Arma 3 is an open world realism-based military tactical shooter video game developed and published by Bohemia Interactive exclusively through the Steam distribution platform. It is the third main entry in the Arma series, and the eighth installment in the series overall. Arma 3 was released for Microsoft Windows on September 12, 2013, and for macOS and Linux on August 31, 2015. Arma 3 primarily takes place in the mid-2030s, on the fictional islands of Altis and Stratis in the South Mediterranean Sea. The game's expansions are set on the South Pacific island of Tanoa; the Strait of Gibraltar island of Malden; the European country of Livonia; the Western Saharan country of Argana; and several real-life locations, including parts of Mainland Southeast Asia, Germany, and Central Europe. The game's maps feature photorealistic terrain and water environments. The game features multiple singleplayer and co-op campaigns, released episodically, most of which follow various perspectives surrounding the 2035 Altis Incident, a war fought in Altis and Stratis.