Portal


 * ''For the entity that creates portals, see prop_portal.

Portal is a unique singleplayer shooter-based puzzle game. Players take control of a single gun that creates two portals, allowing them to go between any two points in space.

Portal has nearly all the code that the Half-Life 2 Episodes have, including hunters and Magnusson devices, though little of this is ever put to use, and the game is missing some of the models and textures needed.