Arma 3 is a realism-based military tactical shooter video game that offers a massive open world, a wide variety of single- and multiplayer content, over 20 vehicles and 40 weapons, and limitless opportunities for content creation. It is the third main entry in the Arma series, and the eighth installment in the series overall.

The game primarily takes place in the mid-2030s, on the fictional islands of Altis and Stratis in the South Mediterranean Sea. The player can experience true combat gameplay in a massive military sandbox, where they can deploy a range of tactics and strategies to defeat their enemy. The game features a dynamic weather system, a day-night cycle, realistic ballistics and physics, and a complex damage model. The game also supports modding and user-generated content, allowing players to create their own scenarios, missions, weapons, vehicles, and more.

Arma 3 was developed and published by Bohemia Interactive exclusively through the Steam distribution platform. It was released on September 12, 2013, and has received several updates and expansions since then. Some of the notable DLCs include Arma 3 Apex, which adds a new terrain, factions, weapons, vehicles, and a co-op campaign; Arma 3 Jets, which introduces fighter jets and an aircraft carrier; Arma 3 Contact, which adds a new singleplayer campaign involving first contact with an alien civilization; and Arma 3 Creator DLC: ČSLA Iron Curtain, which adds a new Cold War-era terrain, factions, vehicles, weapons, clothing, and more.

Arma 3 is widely praised for its realism, immersion, scale, modding community, and replay value. It has received very positive reviews from critics and players alike, and has sold over 6 million copies as of 2022. It is considered one of the best military simulation games ever made, and a must-play for fans of the genre.

Arma 3 offers a variety of gameplay modes and scenarios for different types of players. The singleplayer mode consists of three campaign episodes: Survive, Adapt, and Win, which follow the story of Ben Kerry, a soldier who gets caught up in a Mediterranean flashpoint. The singleplayer mode also features showcase scenarios, which demonstrate the game’s features and mechanics; firing drills, which test the player’s shooting and movement skills; and bootcamp, which provides tutorials and a virtual reality practice environment.

The multiplayer mode allows players to join or host servers with different game modes and missions. Some of the popular multiplayer modes include co-op, which involves cooperating with other players to complete objectives; team deathmatch, which pits two or more teams against each other in a fight to the death; capture the flag, which requires teams to capture and defend flags; and king of the hill, which challenges teams to control a designated area. The multiplayer mode also supports custom missions and mods created by the community.

Arma 3 also features a powerful editor, which enables players to create their own scenarios and missions using a simple drag-and-drop interface. The editor allows players to place units, objects, triggers, waypoints, markers, sounds, scripts, and more on the map. The editor also supports modules, which are pre-made elements that can be easily added to the scenario. For example, the Zeus module allows one player to act as a game master and dynamically control the scenario in real-time. The editor also has a 3D mode, which lets players preview and edit their scenario from a first-person perspective.