Portal 2

Portal 2 is the sequel to Valve's first-person puzzle game Portal.

Following the release of Portal, designer Kim Swift stated that future Portal developments would depend on the community's reactions, saying, "We're still playing it by ear at this point, figuring out if we want to do multi-player next, or Portal 2, or release map packs."

On January 31, 2008, Valve spokesperson Doug Lombardi confirmed that "more Portal" would be forthcoming, and promised that the additional content would not just be "more puzzles"; an interview with Kim Swift on February 21, 2008 revealed that a full sequel, Portal 2, will be coming.

Swift also stated that the team creating the Portal sequel are currently deciding upon the design they should implement and that a multiplayer Portal "from a technology standpoint is possible", though Swift had previously stated they tried a Portal multiplayer variant, but admitted that "Honestly, it's less fun than you'd think."

As of June 10, 2008, news has emerged from the videogame website Kotaku that Valve is looking for voice actors for Aperture Science founder Cave Johnson.