The Portal 2 Perpetual Testing Initiative has begun, which is Valve's way of saying that you can now make spiffy Portal 2 levels using an in-game map editor.
New Portal 2 DLC which allows users to create and share their own levels will be released for PC/Mac on May 8, Valve has announced.
Portal 2 emerged as the big winner at Friday's British Academy Video Game Awards, with Valve's game walking away with Best Game, Design and Story.
The Academy has announced the nominations for the GAME British Academy Video Games Awards, with 48 different games recognised.
Bethesda's The Elder Scrolls V: Skyrim was the big winner at this year's Interactive Achievement Awards. Portal 2 and Uncharted 3 also walk away with numerous awards.