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Obsidian Conflict (TBD)Obsidian Conflict is a free cooperative multiplayer Source Engine game set in the Half-Life 2 universe. It features a large amount of new gameplay features on all-new maps specially designed for Obsidian Conflict 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: Source all the way up to Episode 2.Please enable JavaScript to add this game to your collection