This article has a talk page!This is a sub-page of Halo 3.
In early 2015, Halo: Online was announced as a free-to-play version of Halo 3 exclusively for the Russian market, developed by Saber Interactive. It immediately leaked and served as the basis of the ElDewrito mod, eventually leading to the PC release of MCC.
The MCC version of Halo 3 received two maps and several player cosmetics from HO in the Season 5: Anvil update in 2021. Nevertheless, there's still some extra content in the Halo 3 Editing Kit available on Steam.
s3d_avalanche#
Known as Diamondback ingame, this is a full artpass of the Halo 3 map Avalanche. 
s3d_lockout#
A full remake of the Halo 2 map Lockout. 
s3d_powerhouse#
A backport of the Halo: Reach map Powerhouse. 
s3d_reactor#
A fully original map for H:O, present from the start of the private alpha. 
s3d_sky_bridgenew#
A fully original map for H:O, added in later private beta builds. 