
Valve announced Half-Life 2 at E3 2003, with a release date for that September. They integrated the Havok physics engine, which simulates real-world physics, to reinforce the player's sense of presence and create new gameplay, and developed the characterization, with more detailed character models and realistic animation. Valve president Gabe Newell set his team the goal of redefining the first-person shooter genre. Development lasted five years and cost US$40 million. Half-Life 2 was created using Valve's Source engine, which was developed at the same time. Players control Gordon Freeman as he joins a resistance movement to liberate the Earth from the control of an alien empire, the Combine. Like the original Half-Life (1998), Half-Life 2 combines shooting, puzzles, and storytelling, and adds features such as vehicles and physics-based gameplay. It was published by Valve through its distribution service Steam.


Half-Life 2 is a 2004 first-person shooter game developed by Valve.
