In Arma 2, players engage in a realistic military environment where they must utilize tactical planning and strategy to navigate combat scenarios. The game features a vast open world filled with interactive elements, including destructible environments and AI-controlled wildlife.

The storyline of Arma 2 unfolds in 2009 within the fictional post-Soviet state of Chernarus, where a civil war erupts following a coup. NATO forces are deployed to restore order and sovereignty in the region, providing a backdrop for the player's military engagements.

Arma 2 stands out with its extensive mission editor, allowing players to create custom levels and campaigns, which has led to a vibrant modding community, including the popular mod DayZ. This flexibility enhances the game's longevity and replayability.