Popular games built on game engine Halo 3

Halo 3 is a shooter game where players primarily experience gameplay from a first-person perspective. Much of the gameplay takes place on foot, but also includes segments focused on vehicular combat. The balance of weapons and objects in the game was adjusted to better adhere to the "Golden Triangle of Halo": these are weapons, grenades, and melee attacks, which are available to a player in most situations. Players may dual-wield some weapons, forgoing the use of grenades and melee attacks in favor of the combined firepower of two weapons. Many weapons available in previous installments of the series return with minor cosmetic and power alterations. Unlike previous installments, the player's secondary weapon is visible on their player model, holstered or slung across the player's back. Halo 3 introduces "support weapons", which are cumbersome two-handed weapons that slow the player, but offer greatly increased firepower in return. In addition to weapons, the game contains a new class of gear called equipment; these items have various effects, ranging from defensive screens to shield regeneration and flares. Only one piece of equipment can be carried at a time. The game's vehicular component has been expanded with new drivable and AI-only vehicles.

Halo 3: ODST is a first-person shooter set in New Mombasa during the Covenant invasion. The campaign follows the Rookie, an Orbital Drop Shock Trooper, as he searches the city and reconstructs the events that separated his squad. The game includes the complete Halo 3 multiplayer map collection, with three additional maps, and introduces Firefight, a cooperative mode in which players face waves of Covenant enemies.

Halo Online was a free-to-play multiplayer-only Halo game that was tested exclusively in Russia. The game was cancelled on August 24, 2016, when the developer, Saber Interactive, announced that "the current form of Halo Online will not be released." The reason they gave for the cancellation was that Microsoft had "failed to [make] decisions on the future of the project."

Weapons, Vehicles and Maps from the Star Wars: Battlefront series come to Halo in the ultimate big team crossover.

Halo 3: Combat Evolved is a mod for Halo 3: ODST that re-creates the Halo: Combat Evolved Multiplayer and Campaign experiences within Halo 3: ODST. The goal of this project is to remake every single Campaign and Multiplayer level from Halo: Combat Evolved.

Halo Online was a free-to-play first-person shooter developed by 343 Industries and Saber Interactive, and published by Microsoft Studios and Russian publisher Innova Systems. The game is based on a heavily modified version of Halo 3 (Blam! Engine), optimized to be run on lower-end PCs. A closed beta for the game took place in Russia in spring 2015, but the game was later cancelled with no plans to launch it in other countries. Later, a fan-made mod called ElDewrito revived the game and allowed it to be played worldwide. It gained increased popularity upon the release of Version 0.6, which included many added features that increased its stability and accessibility.

A campaign mod for Halo 3 ODST, Halo: New Covenant takes you on a journey after the events of Halo 3 in a new direction. The campaign includes custom missions designed from scratch, Custom cinematics, Custom voice acting and up to 4 player coop support.