Portal

Portal is a first-person puzzle-platform video game developed by Valve. Set in the Half-Life universe, Portal centers on a woman, Chell, forced to undergo a series of tests within the Aperture Science Enrichment Center by a malicious artificial intelligence, GLaDOS, that controls the facility. 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. This allows complex “flinging” manoeuvres to be used to cross wide gaps or perform other feats to reach the exit for each test chamber. A number of other mechanics, such as lasers, light bridges, tractor funnels and turrets, exist to aid or hinder the player’s goal to reach the exit.