 According to Faliszek , user @-@ generated content for Portal 2 would be available on all platforms , but because of software dependencies , the necessary modding tools would only be available for Windows . Valve released beta versions of the modding tools on May 10 , 2011 , and supported a competition held by the community mapping website " Thinking with Portals " in May 2011 , providing prizes for the most @-@ selected maps . The " Perpetual Testing Initiative " , a free title update for the Windows and Mac versions , was released on May 8 , 2012 , and includes a new level editor and a means of obtaining and sharing user @-@ created levels through the Steam Workshop . In November 2011 , GTTV host Geoff Keighley said that Valve was developing a simplified level editing tool to allow novice editors to assemble test chambers without learning how to use the modified Valve Hammer Editor , and an in @-@ game system to distribute user @-@ created levels via the Steam Workshop . This mapping system entered beta testing in March 2012 . Within a few days of release , the Perpetual Testing Initiative add @-@ on had been used to create 35 @,@ 000 maps , with 1 @.@ 3 million downloads of these maps through Steam . Within a month , more than 150 @,@ 000 user @-@ created maps were available . The first release of the Perpetual Testing Initiative was limited to single @-@ player maps , but a patch released in August 2012 enabled users to create new levels for cooperative play . 
