Half-Life 2
The game that made Steam essential. Silent physicist Gordon Freeman, armed with a gravity gun that weaponized the environment — sawblades, radiators, physics itself — fought an alien occupation in the Eastern European City 17. Five years in development, a $40 million budget, 39 Game of the Year awards — and it required Steam activation, becoming the Trojan horse that made the world install the platform.
Valve began development in June 1999 with a $40 million budget. After five years, Half-Life 2 released on November 16, 2004. You played Gordon Freeman, a silent physicist navigating City 17, an Eastern European city under alien Combine occupation. The game's innovation was the gravity gun, which let you pick up and hurl the world's physics objects — sawblades, radiators — turning the environment into your arsenal. Physics itself became the star.
In October 2003, a German hacker named Axel Gembe infiltrated Valve's network and leaked the source code, damaging morale in the final stretch of development. When Half-Life 2 finally shipped, it required activation through Steam — the first major game to do so. The critical response was overwhelming: 96 on Metacritic, 39 Game of the Year awards, twelve million copies sold by 2011. The game was so good that the activation requirement players might have revolted against became simply the price of playing it.
Half-Life 2 became the standard by which every mid-2000s gaming PC was measured — and the install base Steam was built on. Two follow-ups came: Episode One in 2006 and Episode Two in 2007, which ended on a cliffhanger. Episode Three never arrived, becoming one of gaming's most famous unfinished stories until the prequel Half-Life: Alyx finally returned to the world in 2020.
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