Halo Custom Edition

Halo Custom Edition, sometimes abbreviated Halo CE (which is also often accepted as an abbreviation for Halo: Combat Evolved), is a free expansion that requires a key code of Halo: Combat Evolved by Bungie Studios, which was ported to the PC by Gearbox Software. Halo CE was released by Gearbox as an unsupported version of the original game.

Features
Halo Custom Edition has the ability to load and play user-created content and maps created with the Halo Editing Kit (HEK). Many custom levels have been created by dedicated members of the modding community and have been posted for download at a large number of websites, like Halomaps.org and hce.halomaps.org, which is the Custom Edition website.

Custom maps may contain entirely new content, including:
 * Level geometry
 * Bitmaps
 * Weapons
 * Vehicles
 * Bipeds
 * Sounds
 * Game Interfaces
 * Level Scripts and Interactivity
 * Objects
 * Special Effects
 * Animations
 * HUDs
 * Single Player Modifications
 * AIs in multiplayer maps
 * AI Encounters
 * Cinematics

An arguably better net-code was put into Halo: Custom Edition as well. It has noticeably reduced lagging for some, but for others it made it worse. Also, a Rules feature can be viewed by pressing the F2 button (with default settings). It displays all of the specifics for the game-type currently being played in the server.

In addition to the Rules feature, pressing F3 (by default) will display the name of all allied players above their respective green arrows, so long as friend indicators are enabled in the gametype. This is extremely useful on large maps, where locating a specific player would otherwise be extremely difficult.

With the Halo Editing Kit, AI characters can also be added in a map. This has allowed some map makers to create their own mods that can be played like a campaign mission with checkpoints and objectives, and with some skill, cutscenes. People can also make "teams" of AI that will fight each other. The player can fight alongside Elites and Grunts against Marines, or vice-versa. Also, some map makers have made some entirely new biped AIs, such as retroactively adding Brutes to the Halo campaign.

Limitations
The engine has become frustrating to many map developers, as more complicated features require more complicated procedures. Theoretically, everything possible with the Halo 2/3 engine is also possible with Halo CE, but is often imperfect. Mappers allow boosting through continuous damage indicators, usually behind the player, to speed up the vehicle. This has been modified to deal 0 damage, but still shows arrows indicating damage on the HUD. There are also possibilities of dual-wielding, although still imperfect. The user converts it into one weapon, replacing the secondary trigger(grenades) for the secondary weapon trigger, although when you pick it up, you instantly pick up two instead of one. One of the most frustrating was the limited space for tags, one of the problems the Custom Mapping Team has faced. This has not been a concern to many mappers, though.

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Community
Several modding communities have emerged since the advent of Halo CE. One of the most prominent communities is Halomaps.org which has the most updated multiplayer custom maps. Modders use the Halo Editing Kit to incorporate custom models, images, physics, and data into an easily distributed .MAP file, which is compressed and uploaded. In the game, many clans establish themselves to fight one another on custom maps. They train intensely on some maps, which extends and steepens the learning curve for many players. Halo Custom Edition has also been used for several Machinima videos. As such, there are several modded versions of existing maps, not to mention some completely new maps designed specifically for Machinima. Another popular idea is to make map series which is like a video game series, but much smaller.

Halo Editing Kit
The Halo Editing Kit, commonly referred to by its acronym, HEK, is a repackaging of the development tools that Bungie created and used in the development process of Halo. The Halo Editing Kit was released for the creation of custom content for Halo Custom Edition. It is a free, unsupported add-on released by Gearbox Software.

Developer Mode
The Developer mode, commonly referred to as the devmode, is an external program used to execute commands in Halo: Combat Evolved for the PC. It is used by map designers to test out maps they make. Some designers created a specialized devmode program called "alldev". This allows Custom Edition users to open devmode on servers that they created.

Internal

 * Halomaps.org
 * Halo Map Tools
 * Halo Cache Editor

External

 * Download Halo: Custom Edition
 * Halo PC at Gearbox Software
 * Halomods wiki
 * Halomaps.org website