Half-Life 2 is a 2004 first-person shooter (FPS) game developed and published by Valve Corporation. It was published for Windows on Valve's digital distribution service, Steam. Like the original Half-Life (1998), Half-Life 2 is played from a first-person perspective, combining combat, puzzles, and storytelling. It adds features such as vehicles and physics-based gameplay. The player controls Gordon Freeman, who joins a resistance effort to liberate Earth from the alien Combine empire.