"Portal is a series of first person shooter/puzzle video games developed by Valve Corporation. Set in the Half-Life universe, the two games in the series, Portal (2007) and Portal 2 (2011), center on a human woman, Chell, forced to undergo a series of tests within the Aperture Science Enrichment Center by a malicious artificial intelligence computer, GLaDOS, that controls the facility."@en . . . . .