There are 12 chapters.________ levels
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How many people played portal 2
Portal is the original game in the series. Portal: Still Alive is just extra levels added to the game.
No, Portal is for PC only. Portal 2 is for PS3,Xbox 360,and PC. Plus it would suck on PSP.
Portal 2 comes out on April 18, 2011.
You cannot get a demo for Portal 2, and if there were it would be on Steam as Valve (the creators of Portal 2) distribute all their games there exclusively. However, if you haven't played the first Portal game I would recommend it, and if you like it you'll be sure to love Portal 2!