Arma was originally conceived as a spiritual successor to Operation Flashpoint: Cold War Crisis after Bohemia Interactive lost the intellectual rights to the series.
Queen's Gambit is downloadable content for Armed Assault; it was released in September 2007 (Europe) using the Real Virtuality game engine.
Arma 2: Operation Arrowhead is a standalone installment for Microsoft Windows, released in June 2010 with the Real Virtuality 3 game engine.
[10] Arma 3 is a standalone installment for Microsoft Windows, released on September 12, 2013, using the Real Virtuality 4 game engine.
[11] Arma Reforger is a standalone game released in 2022 into early access for Microsoft Windows and Xbox Series X/S.
[14] Set on the island of Everon (from Operation Flashpoint: Cold War Crisis), Arma Reforger follows a "Cold War gone hot" conflict between the United States, the Soviet Union, and Everon-based rebels.