-- View image here: http://members.arstechnica.com/x/amd4l1ph3/portal_01.png -- <br>-- View image here: http://members.arstechnica.com/x/amd4l1ph3/portal_03.png ...
The fan-made modification to Portal 2, called Portal: Revolution, gained popularity shortly after it was released. With over 40 new test chambers, there are naturally some that players find difficult ...
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