Portal 2's Perpetual Testing Initiative add-on has been voted Best DLC at the 2012 hmv Golden Joystick Awards.
Perpetual Testing Initiative was released in May this year, adding a long-awaited map editor for the physics game which allows players to create, share and play new Portal 2 puzzles.
"The Initiative comes with a simplified puzzle maker that allows that creation of mind-bending puzzles without ever leaving the game," explains Valve. "The puzzle maker can directly publish maps to the Steam Workshop where users can browse, vote on, and select to play them. Selected puzzles will automatically be downloaded and installed inside Portal 2."
Over four million votes were cast in this year's Golden Joysticks - almost twice the previous Guinness World Record-breaking best.
Watch and follow the Awards as they happen in our Golden Joysticks 2012 live stream and blog.