Counter-Strike, a mod for Half-Life developed by Minh Le and Jess Cliffe, is officially released, becoming one of the most influential multiplayer shooters.
Valve releases Half-Life 2, introducing advanced physics, improved graphics with the Source engine, and continuing the story of Gordon Freeman.
Valve releases Half-Life 2: Episode Two, continuing the episodic series and expanding the narrative further.
Valve releases Half-Life: Alyx, a virtual reality (VR) game continuing the Half-Life storyline, revitalizing the franchise after many years.