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Most of the tests involve using the "Aperture Science Handheld Portal Device" – the "portal gun" – that creates a human-sized wormhole-like connection between two flat surfaces. The player-character or objects in the game world may move through portals while conserving their momentum.

Portal (video game) Portal is a 2007 puzzle - platform game developed and published by Valve. It was released in a bundle, The Orange Box, for Windows, Xbox 360 and PlayStation 3, and has been since ported to other systems, including Mac OS X, Linux, Android (via Nvidia Shield ), and Nintendo Switch .

The original Portal was released on May 1, 1997, followed by Portal Second Age on June 24, 1998 and Portal Three Kingdoms on July 6, 1999. The Portal set was inspired by Chinese mythology; Three Kingdoms in particular by the 14th century Chinese historical novel Romance of the Three Kingdoms by Luo Guanzhong. Contents 1 Set history 2 Mechanics

The demo for "The Stanley Parable" takes place in an area created specifically for the demo to show off the premise and humor of the game, as the narrator states multiple times that the player is taking part in a "video game demonstration". In other cases, a demo may differ from the equivalent section in the full game, for instance when the ...