Halo 2

Halo 2 is a 2004 first-person shooter video game developed by Bungie and published by Microsoft Game Studios for the Xbox console. Halo 2 is the second installment in the Halo franchise and the sequel to 2001's critically acclaimed Halo: Combat Evolved. The game features new weapons, enemies, and vehicles, another player character, and shipped with online multiplayer via Microsoft's Xbox Live service. In Halo 2's story mode, the player assumes the roles of the human Master Chief and alien Arbiter in a 26th-century conflict between the United Nations Space Command, the genocidal Covenant, and later, the parasitic Flood.

After the success of Halo: Combat Evolved, a sequel was expected and highly anticipated. Bungie found inspiration in plot points and gameplay elements that had been left out of their first game, including online multiplayer. A troubled development and time constraints forced cuts to the scope of the game, including the wholesale removal of a more ambitious multiplayer mode, and necessitated a cliffhanger ending to the game's campaign mode. Among Halo 2's marketing was an early alternate reality game called "I Love Bees" that involved players solving real-world puzzles. Bungie supported the game after release with new multiplayer maps and updates to address cheating and glitches. The game was followed by a sequel, Halo 3, in September 2007.

Halo 2 was a commercial and critical success and is often listed as one of the greatest video games of all time. The game became the most popular title on Xbox Live, holding that rank until the release of Gears of War for the Xbox 360 nearly two years later. Halo 2 is the best-selling first-generation Xbox game, with more than 8 million copies sold worldwide. The game received critical acclaim, with the multiplayer lauded; in comparison, the campaign and its cliffhanger ending was divisive. The game's online component was highly influential and cemented many features as standard in future games and online services, including matchmaking, lobbies, and clans. Halo 2's marketing heralded the beginnings of video games as blockbuster media. A port of the game for Windows Vista was released in 2007, followed by a high-definition remaster as part of Halo: The Master Chief Collection in 2014.

Gameplay

Halo 2 is a shooter game. Players primarily experience gameplay from a first-person perspective, with the viewpoint shifting to third-person for vehicle segments. Players use a combination of human and Covenant weaponry and vehicles to progress through the game's levels. Certain weapons can be dual-wielded, allowing the player to trade accuracy, the use of grenades, and melee attacks for raw firepower. The player can carry two weapons at a time (or three if dual-wielding, with one weapon remaining holstered), with each weapon having strengths in different combat situations. Most Covenant weapons, for example, eschew disposable ammo magazines for a contained battery, which cannot be replaced once depleted. However, these weapons overheat if fired continuously. Human weapons are less effective at penetrating shields and require reloading ammunition, but cannot overheat due to prolonged fire. Players can hijack enemy vehicles and quickly assume control of them. The player is equipped with a damage-absorbing shield that regenerates when not taking fire; their health bar is not visible.

The game's "Campaign" mode offers options for both single-player and cooperative multiplayer participation. In campaign mode, the player must complete a series of levels that encompass Halo 2's storyline. These levels alternate between the Master Chief and a Covenant Elite called the Arbiter, who occupy diametrically opposed roles in the story's conflict. Aside from variations in storyline, the Arbiter differs from Master Chief only in that his armor lacks a flashlight; instead, it is equipped with a short duration rechargeable form of active camouflage that disappears when the player attacks or takes damage. There are four difficulty levels in campaign mode: Easy, Normal, Heroic, and Legendary. An increase in difficulty will result in an increase in the number, rank, health, damage, and accuracy of enemies; a reduction of duration and an increase in recharge time for the Arbiter's active camouflage; a decrease in the player's health and shields; and occasional changes in dialogue. Enemy and friendly artificial intelligence is dynamic, and replaying the same encounters repeatedly will demonstrate different behavior.

Like Halo: Combat Evolved, the Xbox version of Halo 2 features a multiplayer system that allows players to compete with each other in split-screen and system link modes; in addition, it added support for online multiplayer via Xbox Live. Instead of implementing multiplayer by having players manually join lobbies, as was common in games at the time, Halo 2 used matchmaking. Players chose the general type of match they want to play, and the game selected the map and gametype and automatically found other players. This "playlist" system automated the process of finding matches to keep a steady flow of games available at all times, and combined a skill-ranking system on top.

The Xbox Live multiplayer and downloadable content features of the Xbox version of Halo 2 were supported until the discontinuation of the service in April 2010, with the final multiplayer session concluding May 10, almost a month after the service was officially terminated. Multiplayer for the PC version of the game used Games for Windows – Live. The PC multiplayer servers were taken offline in June 2013. Online servers for the original Xbox version were made available again with an unofficial service, Insignia, in 2024.