Plot: The Crossing is a cancelled first-person shooter video game by Arkane Studios, which attempted to fuse single-player and multiplayer by threading its single-player campaign through live multiplayer games. Wikipedia
Plot: SiN Episodes were a planned series of episodic games for Microsoft Windows that would have expanded upon the 1998 computer game SiN. A total of nine episodes were planned with only the first one released. Wikipedia
Plot: Half-Life 2: Lost Coast is an additional level for the 2004 first-person shooter video game Half-Life 2. Developed by Valve, it was released on October 27, 2005, through the Steam content delivery service as a free download to owners of the Windows version of Half-Life 2. Wikipedia
Plot: Nuclear Dawn is a post-apocalyptic first-person shooter real-time strategy hybrid video game. It was originally announced in February 2006 as an amateur mod for the Source engine, but in April 2009 was revealed to have become a commercial project, still using Source, aimed at Windows PCs and Mac OS...
Plot: NeoTokyo is a multiplayer tactical first-person shooter total conversion modification of Half-Life 2 in a futuristic cyberpunk setting, created by American developer Studio Radi-8. Wikipedia
Plot: The Ship is a first-person shooter video game developed by Outerlight using Valve's Source engine. The game was released on July 11, 2006, on Steam with retail distribution in Europe and Australia in September, and April 10, 2007, for North America. Wikipedia
Plot: Half-Life: Decay is a multiplayer-only expansion pack for Valve's first-person shooter Half-Life. Developed by Gearbox Software and published by Sierra On-Line, Decay was released as part of the PlayStation 2 version of Half-Life in 2001. Wikipedia
Plot: Half-Life 2: Survivor is an arcade game based on Half-Life 2. It was released on June 28, 2006, on Taito's Type X+ arcade system, with a 32 widescreen high definition LCD running at 1360x768 resolution.