I. Overall Storytelling Portal is a short first-person puzzle platformer through which the player progresses by shooting a portal gun to escape from Aperture Science’s testing facility and from the insane AI that lies within. On its surface, the game seems straightforward enough: create portals, drop the cube, and reach the end. However, the appearance and solitude of the facility as well as GLaDOS’ constantly-evolving dialog set Portal apart from a typical puzzle platformer,