A sequel, Half-Life 2, was released in 2004, followed by Half-Life 2: Episode One (2006), Episode Two (2007), and Half-Life: Alyx (2020). Half-Life sparked numerous fan-made mods, several of them becoming standalone games, notably Counter-Strike, Day of Defeat and Sven Co-op. Valve ported Half-Life to its Source engine in 2004, while a third-party remake, Black Mesa, was released in 2020. It was ported to the PlayStation 2 in 2001, along with another expansion Half-Life: Decay, and to mac-OS and Linux in 2013. It was followed by the expansion packs Opposing Force (1999) and Blue Shift (2001). By 2008, the game had sold over 9 million copies. It won over fifty PC 'Game of the Year' awards and is considered one of the most influential games of the first-person shooter genre, as well as one of the best video games ever made. Half-Life received acclaim for its graphics, realistic game-play, and seamless narrative. They built Half-Life using Goldsboro, a heavily modified version of the Quake engine, licensed from id Software. Valve co-founder Gable Ne-well said the team aimed to create an immersive world rather than a 'shooting gallery'. Unlike many other games at the time, the player has almost uninterrupted control of Freeman, and the story is told mostly through scripted sequences seen through his eyes. The core game-play consists of fighting alien and human enemies with a variety of weapons and solving puzzles. Players assume the role of Gordon Freeman, a scientist who must find his way out of the Black Mesa Research Facility after it is invaded by aliens. It was Valve's debut product and the first game in the Half-Life series.

Half-Life is a first-person shooter game developed by Valve and published by Sierra Studios for Windows in 1998.

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