Here’s a clip from ‘Portal’, a game by Valve. The game is built around a gun that shoots teleport portals. You can shoot to place a portal on a wall, ceiling, floor, under an object, etc. then shoot again to place the other opening to the portal.
This. Looks. So. Cool.
Portal looks to be a single player game that stresses puzzle-solving. GameSpy is reporting that it will ship with Half-Life 2: Episode 2.