The sequel to Portal is Portal 2.
Portal 2 . It is the sequel to Portal ( 2007 ) and was released on April 19 , 2011 , for Microsoft Windows , OS X , Linux , PlayStation 3 , and Xbox 360 . Although some reviewers initially expressed concerns about the difficulty of expanding Portal into a full sequel , Portal 2 received critical acclaim , particularly for its writing , pacing , and dark humor .