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.

Halo games available on Steam

 * Halo: Spartan Assault (2013)
 * Halo: Spartan Strike (2015)
 * Halo Wars: Definitive Edition (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 (TBA 2021)