Half-Life 2 is a science fiction first-person shooter computer game and the sequel to the highly acclaimed Half-Life. It was developed by Valve Corporation and was released on November 16, 2004, following a protracted five-year, $40 million development cycle during which the game’s source code was leaked to the Internet. The game uses the Source game engine, which includes a heavily modified version of the Havok physics engine. Originally available only for Windows-based personal computers, the game has since been ported to the Xbox, Xbox 360, and PlayStation 3 video game consoles.
Half-Life 2 takes place in a dystopian world in which the events of Half-Life have fully come to bear on human society, which has been enslaved by the extraterrestrial civilization known as the Combine. The game takes place in and around the fictional City 17 and follows the adventures of scientist Gordon Freeman. Freeman must fight against increasingly unfavorable odds in order to survive.