Horde Mode - The Doom Wiki at

Horde Mode is an expansion for Doom Eternal introduced with Update 6.66 on October 26, 2021. It is available to all players who own Doom Eternal or either of its downloadable content expansions, The Ancient Gods, Part One and The Ancient Gods, Part Two, even if they have been purchased as standalone items.[1]

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Dive Into Horde Mode, New Master Levels, and More Today in Doom