As many of you know there is a Nazi zombie co-op mode called ‘Nacht der Untoten’, which is unlocked upon completing the singleplayer campaign of Call of Duty: World at War. Treyarch have now unlocked this mode for all players by removing the campaign completion requirement. This is a smart move since not everyone is into singleplayer games, and so forcing them to play through it just to unlock a multiplayer mode can be hassle. World at War’s campaign is a blast though, so they’d be missing out.