Obsidian Conflict is a cooperative multiplayer modification set in the Half-Life 2 universe. It features a large amount of new gameplay features on all-new maps specially designed for the mod with focus on cooperative gameplay, as well as over hundred user-made maps following the same formula. In addition to that, You're able to play through vanilla Half-Life 2 all the way up to Episode 2, as well as experimental support for cooperative Half-Life: Source play.
!!THIS INSTALLER IS OUTDATED AND DOES NOT COME WITH THE REQUIRED FIXES!! We advise just downloading "OC 1.35 Unofficial Mountfix (Full installer)" instead, as it comes with the required fixes. Otherwise you'll have to download and run the mountfix manually after installing OC. Note: The playermodel installer is unavailable. Just hit "Cancel" during that dialog pop-up and the installer will continue properly.