Gears of War 3 is a third-person shooter video game developed by Epic Games and published by Microsoft Studios exclusively for the Xbox 360. Originally due for release in April 2011, the game was delayed and eventually released on September 20, 2011.

Gears of War 3 made over one million pre-orders making it one of the most anticipated games of 2011. It is the third installment of the Gears of War series, and the final game in the current story arc.

The story was written by science fiction author Karen Traviss, who has authored four Gears novels and is working on the next one.

Gears of War 3, like its predecessors, is a third-person shooter that emphasizes the use of cover and squad tactics in order to survive combat situations. The player's character can carry four weapons: one pistol, one set of grenades, and two other weapons. Firearms can be swapped with other weapons dropped by fallen foes or at stockpiles throughout the game, along with ammunition. When the player reloads a weapons ammunition, they have an opportunity for an "active reload", shown by a small cursor moving over a line with a marked section on the player's heads-up display (HUD). If the player hits a control button when the cursor is in the marked section, they will reload faster with the resulting reload being slightly more powerful than normal bullets, causing more damage to opponents. If they press the button outside this section, this temporarily jams the weapon, leaving the player vulnerable and taking longer to reload. Alternatively, the player can opt to not try to for the active reload, reloading the weapon at normal speed, but with no added damage.

Artillery is the generic name for either early two- or three-player (usually turn-based) video games involving tanks fighting each other in combat or similar derivative games. Artillery games are among the earliest computer games developed; the theme of such games is an extension of the original uses of computer themselves, which were once used to calculate the trajectories of rockets and other related military-based calculations. Artillery games have been described as a type of "shooting game", though they are more often classified as a type of strategy game.

Early precursors to the modern artillery-type games were text-only games that simulated artillery entirely with input data values. A BASIC game known simply as Artillery was written by Mike Forman and was published in Creative Computing magazine in 1976. This seminal home computer version of the game was revised in 1977 by M. E. Lyon and Brian West and was known as War 3; War 3 was revised further in 1979 and published as Artillery-3. These early versions of turn-based tank combat games interpreted human-entered data such as the distance between the tanks, the velocity or "power" of the shot fired and the angle of the tanks' turrets.

Gears of War is a military science fiction third-person shooter video game developed by Epic Games and published by Microsoft Game Studios. It was initially released as an exclusive title for the Xbox 360 in November 2006 in North America, Australia, and most of Europe and included a "Limited Collector's Edition" with added content and an art book titled Destroyed Beauty that detailed much of the game's back-story. Despite the initial statements of Xbox 360 exclusivity, a Microsoft Windows version of the game was developed in conjunction with People Can Fly and released a year later, featuring new content including additional campaign levels, a new multiplayer game mode, and Games for Windows Live functionality.

The game focuses on the troops of Delta Squad as they fight a desperate, last-ditch attempt to save the remaining human inhabitants of the fictional planet Sera from a relentless and virtually unstoppable subterranean enemy known as the Locust Horde. The player assumes the role of Marcus Fenix, a former prisoner and war-hardened soldier. The game is based on the use of cover and strategic fire for the player to advance through the scenarios; a second player can play cooperatively through the main campaign to assist. The game also features several online multiplayer game modes for up to eight players.