This is another of Valve Software’s first-person shooters, although you’re really not shooting anything alive. Instead of a laser rifle, players equip a portal gun that shoots wormhole-connected openings, or portals, on flat surfaces.
It’s a puzzle platformer game at heart, requiring the player to think about how to move onto the next room using these portals. That said, this may be an ideal experience for multiple players as they talk out where a portal should go and when.
In the multiplayer mode, which takes place after the single-player campaign, two players assume bipedal robots named Atlas and P-Body that have their own portal guns. The object is to locate The Vault, which contains humans stored in stasis.
Naturally, the artificial intelligence GLaDOS keeps them busy, testing their puzzle skills along the way. Portal 2 is available on Windows, Mac OS X, Linux, the PlayStation 3, and the Xbox 360.