Update 6.66 is often called "The Ultimate DOOM" update because of the massive amount of free content it added. Horde Mode: Review — DOOM Eternal Update 6.66

The represents the ultimate, definitive version of id Software’s high-octane masterpiece. This specific "v666" milestone isn't just another patch; it’s a colossal content drop that includes everything from the base game and expansions to the community-favorite Horde Mode and a completely rebuilt multiplayer experience. What’s Included in the Deluxe Edition v666?

Switch back to the nostalgic sounds of the original DOOM arsenal. New Features in Update 6.66 Rev 2

Battle through waves of demons to earn high scores and rewards.

: A massive arcade-style mode where players face increasingly difficult waves of demons to earn rewards like the Biker Slayer and Doom 2 Marine skins. Battlemode 2.0