ARMA 2 is a tactical shooter video game for the PC developed by Bohemia Interactive Studio.

Gameplay
ARMA 2 is a tactical shooter with significant vehicle and aircraft elements.
The area of approximately 225 km2 is based on actual satellite photos of Českщ Středohořэ. All necessary data is loaded silently in the background, therefore the player is at no time interrupted by any loading screens while traveling through the terrain, though there are loading screens between episodes.

ARMA 2 features 6 distinct armed factions, all with their own vehicles and weapons, around 80 realistically represented weapons with many variants from including assault rifles, machine guns, and missile launchers. There are around 130 vehicle variants, and any vehicle that exists in-game can be controlled by the player, including everything from civilian cars, tractors and bicycles. Similarly, all aircraft encountered in the game can be flown by the player. All have limited fuel and realistic weapon loadouts.

All weapons have realistically simulated ballistics. Rounds travel in parabolic trajectories and show effects of bullet drop dependent on their caliber. Muzzle velocities are modeled, and rounds lose velocity and knockdown power over time traveled. The ranges at which weapons are zeroed are fixed in the base game, although the Arrowhead expansion allows this to be modified. Sniper rifles can use stadiametric rangefinding to adjust for long-range shots. US rifles use mil-dot scopes while Russian rifles use Bullet Drop Compensation (BDC) scopes such as the PSO-1. In additions, bullets will ricochet from surfaces depending on angle of impact. Penetration is also models, with rounds that pass through materials suffering from altered velocity and direction.

In June 2011 Bohemia Interactive released a free to play version of ARMA 2, featuring full multiplayer compatibility with the retail version of ARMA 2. However the singleplayer campaign has been omitted and players will not be able to use HD textures, mods or play with Operation Arrowhead or DLC content. Essentially it serves as a "Lite" version of the game.