•: December 4, 2007 Mode(s), Halo: Combat Evolved is a 2001 developed by and published. 
It was released as a for Microsoft's on November 15, 2001. Microsoft released versions of the game for and in 2003.
Then you see an Elite crack a Bravo Kilo's head with one—the things are built tough. 4.1 Halo: Combat Evolved; 4.2 Changes from Halo: Combat Evolved to Halo 2. The Plasma Rifle in Halo: Combat Evolved kills fully-shielded Spartans in 9. Protocol, page 110; ^ Halo: Broken Circle, page 113 (Google Play edition).
The game was later released as a downloadable for the. Halo is set in the, with the player assuming the role of the, a enhanced. The Chief is accompanied by, an. Players battle various aliens as they attempt to uncover the secrets of the eponymous, a ring-shaped.
Bungie began development of what would eventually become Halo in 1997. Initially, the game was a real-time strategy game that morphed into a third-person shooter before becoming a first-person shooter.
During development, Microsoft acquired the studio and turned the game into a launch title for its new video game console, the Xbox. Halo was a critical and commercial success.
Halo has been praised. The game's popularity led to labels such as ' Halo clone' and ' Halo killer', applied to games either similar to or anticipated to be better than it.
Halo spawned a that has grossed more than $4.6 billion worldwide, incorporating games, books, toys, and films. In addition, the game inspired and was used in the fan-created video series, which is credited as the 'first big success' of (the technique of using real-time 3D engines, often from video games, to create animated films). More than five million copies were sold worldwide by November 2005. A,, was released for Xbox 360 on the 10th anniversary of the original game's launch. Anniversary was rereleased for as part of in 2014. The fires his MA5B Assault Rifle at a pack of enemy Grunts.
Ammunition, health, and motion sensor displays are visible in the corners of the screen. Halo: Combat Evolved is a shooter game in which players experience gameplay in a 3D environment almost entirely from a (FPS). The player can move around and look up, down, left, or right. The game features vehicles, ranging from armored jeeps and tanks to alien hovercraft and aircraft, many of which can be controlled by the player.
The game switches to a during vehicle use for pilots and mounted gun operators; passengers maintain a first-person view. The game's includes a 'motion tracker' that registers moving allies, moving or firing enemies, and vehicles, in a certain radius of the player. The player character is equipped with an energy shield which nullifies damage from weapons fire and forceful impacts. The shield's charge appears as a blue bar in the corner of the game's heads-up display, and it automatically recharges if no damage is sustained for a brief period. When the shield is fully depleted, the player becomes highly vulnerable, and further damage reduces the of a secondary health meter.
When this health meter reaches zero, the character dies and the game reloads from a saved checkpoint. Health can be replenished through the collection of health packs scattered around the game's levels. Halo's arsenal consists of. The game has been praised for giving each weapon a unique purpose, thus making each useful in different scenarios. For example, plasma weapons need time to cool if fired too rapidly, but cannot be reloaded and must be discarded upon depletion of their batteries, whereas conventional firearms cannot overheat, but require reloading and ammunition. In contrast to the large weapon inventories of contemporary FPS games, Halo players may carry only two weapons at once, calling for strategy when managing firearms.
Halo departs from traditional FPS conventions by not forcing the player character to holster its firearm before deploying or melee-range; instead, both attacks can be utilized while a gun is still equipped, supplanting or supplementing small-arms fire. Like the game's other weapons, the two types of grenades differ; the fragmentation grenade bounces and detonates quickly, whereas the plasma grenade adheres to targets before exploding.
The game's main enemy force is the, a group of alien species allied by belief in a common religion. Their forces include, fierce warriors protected by recharging energy shields similar to the player's own;, which are short, cowardly creatures who are usually led by Elites in battle, and often flee in terror instead of fighting in the absence of a leading Elite;, originally space pirates, who wear a highly durable energy shield on one arm and a form of handgun on the other; and, large, powerful creatures composed of small worm-like colonies with thick armor plates that cover the majority of their bodies and a large assault cannon that fires explosive rounds of green plasma. A secondary enemy is the, a alien life form that appears in several variants. Other enemies include Sentinels, aerial robots designed by an extinct race called the to protect their structures and prevent Flood outbreaks. Sentinels are able to hover around in enclosed spaces and produce an energy shield when under attack. They lack durability, but use powerful laser beam weapons and are immune to infection by the Flood.