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No More Room in Hell is a total conversion inspired by the films of George Romero. This survival horror game features eight-player co-op and hordes of npc zombies. (Multiplayer mods)
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Research and Development, a "non-combative" modification that has been likened to Portal, in which the player uses the gravity gun and other aspects of the Source engine physics to solve puzzles and progress forward. (Single-player mods)
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Fortress Forever - A mod based on Valve's Team Fortress Classic, but has been created entirely from scratch by the Fortress Forever development team. The intended scope of Fortress Forever is to please the adamant Team Fortress Classic fans, while at the same time creating a game enjoyable enough to players new to Team Fortress styled games. The mod was released on September 13, 2007. Fortress Forever received "Best mod of 2007" in PC Gamer magazine. (Multiplayer mods)
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Black Mesa - A recreation of Half-Life using the more advanced Source engine. (Single-player mods)
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Garry's Mod - A "sandbox" mod that allows the player to manipulate objects using the Source physics engine. Allows both single and multi-player interaction. Version 13 released commercially and version 9 is still available on Steam. Garry's Mod received Mod DB's "Player's Choice Honorable Mention" from Mod DB in 2006, "Mod of the Year" in 2005 and "Genre Award: Puzzle" in 2005. (Multiplayer mods)
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Portal: Prelude - An unofficial prequel to Portal, set before the activation of GLaDOS when scientists used to watch over the test chambers and instruct the test subjects. (Single-player mods)
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