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's president, Gabe Newell, set his team the goal of redefining the FPS genre. Development lasted five years and cost $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 a multidimensional 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 first published by Valve for Windows through its distribution service Steam. And more.Half-Life 2 is a 2004 first-person shooter (FPS) game developed by Valve. Supernova a StarMake a star evolve by cranking up its age or mass, then watch a supernova unfold. Deform SurfacesImpact planets with asteroids and comets and leave behind massive, molten craters. Terraform PlanetsAdd carbon dioxide to a planet's atmosphere to heat it up. Or move the Earth farther from the Sun and freeze the entire planet. Model Earth's ClimateWatch sea ice grow and recede with the seasons because of the tilt of the Earth: change the tilt and change the seasons. Collide Planets & StarsEpic, mind blowing collisions of massive planetary bodies. Real science, real physics, no supercomputer required. This is a free, automatic update.Simulate GravityN-body simulation at almost any speed using Newtonian mechanics. Universe Sandbox ² includes the desktop version and a VR mode with support for the HTC Vive & Oculus Rift+Touch. Universe Sandbox ² is the long-awaited sequel to the original Universe Sandbox. It merges real-time gravity, climate, collision, and material interactions to reveal the beauty of our universe and the fragility of our planet.

Universe Sandbox ² is a physics-based space simulator that allows you to create, destroy, and interact on an unimaginable scale.

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