Half Life 2: Orange Box
Once again players assume the role of Gordon Freeman, a scientist destined to save the Earth from hordes of gruesome alien attackers. Valve has created a fully realized world in Half-Life 2, with objects and characters that feature accurate physics properties, behaving with the appropriate mass, density, and physical properties of their real-life counterparts. Extremely intelligent computer AI result in enemies that plan, adapt, and respond to the player's actions.
This version comes packed with bonuses in addition to the genre-expanding original Half-Life 2 game. Half-Life 2: Episode One and Episode Two add-on levels are also on the disc, as are the stunningly complex puzzle game Portal and the online phenomenon Team Fortress 2.