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"Portal has been replicated on a graphing calculator. Programmed using Axe, a language designed for Texas Instruments graphing calculators, Portal Prelude is a playable 2D game inspired by a Flash clone popularised on the internet.      The fan project was undertaken by Builderboy2005 and was finished earlier this month. &amp;quot;Long before GLaDOS ever ran the facility, step into the shoes of a test subject and test the Aperture Science Handheld Portal Device (ASHPD) for yourself!&amp;quot; reads the game description on Omnimaga. &amp;quot;Test your way through 38 devious test chambers using Portals, in addition to many other intriguing gameplay elements such as plasma balls and electric fields.&amp;quot; The critically-acclaimed Portal series is developed by Valve and has seen releases on PC, Mac, Xbox 360 and PlayStation 3. &amp;gt; Mario and &amp;#039;Portal&amp;#039; mash-up game - video &amp;gt; &amp;#039;Portal 2&amp;#039; Wheatley puppet - video "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/fun/news/a444276/portal-on-a-graphing-calculator-video/>