It was developed by The Chinese Room and released September 19, 2009.

Korsakovia - A single-player mod for Half-Life 2.

The game acts as a side story to the movie where the player takes the role of the park's game warden, Robert Muldoon.

Jurassic Life - A modification based on the first Jurassic Park film.

Flipside - A side-scrolling platform game that allows the player to 'flip' the game world around to its backside, altering the means a player can traverse a level.

Entropy: Zero 2 - A sequel to Entropy: Zero in which the player takes control of a Combine Elite soldier tasked with tracking down Judith Mossman and the Borealis.

Entropy: Zero - A Half-Life 2 modification developed by Breadman and set before the base game's story in which a Combine Metrocop becomes stranded in City 10.Dear Esther - An experimental 'ghost story' created as a research project at the University of Portsmouth initially released as a free modification in 2008, a longer commercial version was developed and released in 2012.Coastline to Atmosphere - A mod set in the Half-Life 2 universe, following Gordon Freeman after the events of Half-Life 2.Black Mesa originally released as a free mod in September 2012, and later had a full commercial release on Steam in March 2020.

Black Mesa - A third-party recreation of Half-Life (1998) that was made in response to the release of Half-Life: Source (2005), a port of the original game to the Source engine.Instead of a portal gun, the player solves puzzles using a mix of these gels that they can spray onto surfaces with a tool they carry. Aperture Tag - A modification based on Portal 2 that recreates the essence of the game Tag: The Power of Paint, the inspiration for the various gels used in Portal 2.This list is divided into single-player and multiplayer mods. This is a selected list of Source engine mods (modifications), the game engine created by Valve for most of their games, including Half-Life, Team Fortress 2, and Portal, as well as licensed to third parties.

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