Liste der Änderungen im Patch 1.6:

■3 new Multiplayer maps: Battery (mp_drum), Breach (mp_bgate), Revolution (mp_vodka)!

■New Nazi Zombie map: Der Riese (nazi_zombie_factory), an all-new Zombie map set in a secret Nazi research facility featuring the Pack A Punch Machine, Teleporters, and many more undead hordes!

■Exploits pertaining to Demo playback.

■Favorites list now ignores filter settings.

■Fixed S&D round counting error when roundlimit is reached.

■New feature: in-game Add to Favorites.

■Friends list: green online indicator.

■Starting the game in Safe Mode will no longer toggle the “Soften Smoke Edges” graphic option.

■Fixed various crashes.

■Mods: Client will no longer join a modded Co-op server via Game Invite unless they have that mod loaded.

■Mods: Client running a mod will be asked to unload the mod if they attempt to join an unmodded server.

■Mods: All singleplayer levels can now be run with a mod loaded.