A standalone version, titled Portal: Still Alive, was released on the Xbox Live Arcade service in October 2008, which added 14 puzzles to the gameplay, and a sequel, Portal 2, which was released in 2011, adding several new gameplay mechanics and a cooperative multiplayer mode. Excluding Steam download sales, over four million copies of the game have been sold since its release, spawning official merchandise from Valve including plush Companion Cubes, as well as fan recreations of the cake and portal gun. Portal is often cited as one of the greatest video games of all time. 1 : Discrete Incorporated ( GTA ) blending process to antimisting fuel Micro. GLaDOS, voiced by Ellen McLain in the English-language version, received acclaim for her unique characterization, and the end credits song "Still Alive", written by Jonathan Coulton for the game, was praised for its original composition and humorous twist. Classification of liquid gun propellants and raw Turbine. The game received praise for its originality, unique gameplay and dark story with a humorous series of dialogue.
Portal was acclaimed as one of the most original games of 2007, despite criticisms of its short duration and limited story.
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