2007's Game of the Year gets a proper sequel with Portal 2 ($50-$60). Available for the PS3, Xbox 360, PC, and Mac, this mindbending action/puzzle/platformer brings next-generation gameplay to its significantly expanded single-player mode, advanced physics for more varied movements and challenges, and a two-person co-op mode featuring its own separate storyline and characters, which can be played locally via split-screen or online... assuming Sony ever gets its Playstation Network back up and running. [Thanks, Frank]