Steam

Steam is an online platform that allows users to download and play PC games. The service is operated by Valve. Several Halo games on Steam offer Steam rewards which include Halo themed: trading cards, badges, emoticons, and backgrounds. Emoticons, and backgrounds can also be unlocked via the Steam Points Shop, which uses Steam Points, a currency earned by purchasing games, DLC, micro-transactions, and subscriptions.

As of September 2021, 343 Industries plans to implement Steam Workshop support for modding of Halo: The Master Chief Collection.

Games

 * Halo: Spartan Assault (April 4, 2014)
 * Halo: Spartan Strike (December 12, 2015)
 * Halo Wars: Definitive Edition (April 20, 2017)
 * Halo: The Master Chief Collection (December 3, 2019)
 * Halo: Reach (December 3, 2019)
 * Halo: Combat Evolved/Halo: Combat Evolved Anniversary (March 3, 2020)
 * Halo 2/Halo 2: Anniversary (May 12, 2020)
 * Halo 3 (July 14, 2020)
 * Halo 3: ODST (September 22, 2020)
 * Halo 4 (November 17, 2020)
 * Halo Infinite (December 8, 2021)

Software

 * Halo: Combat Evolved Mod Tools (June 23, 2021)
 * Halo 2 Mod Tools (October 13, 2021)
 * Halo 2: Anniversary Mod Tools (October 13, 2021)
 * Halo 3 Mod Tools (October 13, 2021)
 * Halo 3: ODST Mod Tools (TBA)
 * Halo: Reach Mod Tools (September 6, 2022)
 * Halo 4 Mod Tools (TBA)