A sarcastic, female-voiced computer will monitor your performance and serves as a droll guide for each area. Turret guns, toxic liquid, crushing walls, and other hazards must also be avoided throughout play. Storage and weighted 'companion' cubes found within rooms are creatively used to activate switches, knock out security droids, and more.

Portals can be fired on most surfaces, and the gun can also be used to pick up and toss objects. One could be used as an entrance, while the other used as an exit. Instead of lasers or bullets, the gun fires one of two opposing portal types: orange and red. The object is to advance through a series of rooms by using a gun to create a means of escape. Portal is a 3D puzzle game played from a first-person perspective. Freeman will interact with several friendly characters as well as drive an assortment of vehicles in his quest to defeat the ruthless Combine. One of the key features in Half-Life 2 and its expansions is the use of physics to interact with the environment, whether it's pushing cinder blocks to create a staircase or using a gravity gun to hoist and then slam objects into enemies. Half-Life 2 continues the saga of scientist Gordon Freeman, who finds himself in a world overrun by an alien army known as the Combine. They are joined by the standalone puzzle game, Portal, and the team-based online shooter, Team Fortress 2. The most recognizable games in the package are 2004's critically acclaimed Half-Life 2 and its first two expansion packs, Episode One and Episode Two. The Orange Box is a five-game collection of best-selling Valve hits and anticipated new releases.

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