Portal is a single-player puzzle-platformer developed by Valve Corporation.

Portal was originally released in a bundle called The Orange Box for Microsoft Windows and Xbox 360 in October 2007 and for the PlayStation 3 in December 2007.

The player has to negotiate a series of increasingly complex puzzle rooms using a hand-held device that can both create teleportation portals and lift objects.

Portal is based on and developed by the same team who produced a freeware game called Narbacular Drop

See also