The Orange box is a set of video games which contains five games, all powered by Valve Corporation's Source engine. Two out of these five games, Half-Life 2 and its first stand-alone expansion, Episode One, had previously been released as separate games. Three new games were also included in the compilation: the second stand-alone expansion, Half-Life 2: Episode Two, the puzzle game Portal, and Team Fortress 2 (which is now a free-to-play game on Valve's PC platform Steam), the multiplayer game sequel to the original mod based on the Quake engine, Team Fortress and Team Fortress Classic on the original Half Life.
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