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Critical Mass is a single player Source mod. A four-player coop mode may be implemented depending on the modability of Left4Dead. This mod has no storyline connection to that of the Half-Life franchise, or any Valve product. The story is rich and polished, see the official website for more elaboration. In short, you play the role of Logan Bowes, a captain and squad leader in a future military. The squad consists of four characters, so if the coop mode does get made, each player will fill the roles of one of the four squad members.
A Terragen image for the desert skybox.