Newell said that the approach would allow Valve to release products more quickly after the six-year Half-Life 2 development, and that he considered the trilogy the equivalent of Half-Life 3. In May 2006, Valve announced a trilogy of episodic games that would continue the Half-Life 2 story, with the final episode planned for release by Christmas 2007. Set 5 years before Half-Life 2, players control Freeman's ally Alyx Vance in her quest to defeat the alien Combine. In 2020, after years of speculation, Valve released its flagship virtual reality game, Half-Life: Alyx. Over the following decade, numerous Half-Life games were canceled, including Episode Three, a version of Half-Life 3, and games developed by Junction Point Studios and Arkane Studios.

The first game in the Portal series, set in the same universe as Half-Life, was released in 2007. It was followed by the extra level Lost Coast (2005) and the episodic sequels Episode One (2006) and Episode Two (2007). In 2004, Valve released Half-Life 2 to further success, with a new setting and characters and physics-based gameplay. Half-Life was followed by the expansions Opposing Force (1999), Blue Shift (2001) and Decay (2001), developed by Gearbox Software. The innovative scripted sequences were influential on the FPS genre, and the game inspired numerous community-developed mods, including the multiplayer games Counter-Strike and Day of Defeat. Players control Gordon Freeman, a scientist who must survive an alien invasion. The original Half-Life, Valve's first product, was released in 1998 for Windows to critical and commercial success. The games combine shooting combat, puzzles and storytelling.

Half-Life is a series of first-person shooter (FPS) games developed and published by Valve.

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