In just a couple of days there have been a whopping 35,000 maps made by fans of Portal 2, Valve reported.

There have been more than 1.3 million downloads collectively since the release of the new level editor: Portal 2 Perpetual Testing Initiative.

As a celebration, Valve have reduced the price of a load of games on Steam. Portal 2 is up for grabs at just $6.79, The Elder Scrolls V: Skyrim has been reduced to $40.19 and a ton of Team Fortress 2 Workshop items are reduced by 50%.

There's more information on the Perpetual Testing Initiative over at the Steam Workshop site.