The good people at Valve have announced their second add-on for the year’s highest rated multiplatform game, Portal 2, is in development and targeted for release early next year. quite a major update, it will feature an easy-to-use in game map editor that allows players to create and share their own test chambers for both single player and co-operative play. These creations can be shared with the community, who can then view, play and vote on them with a simple click.

It’s also worth noting that Portal 2 holds a Metacritic score of 95%, making it the highest rated multiplatform game of 2011 thus far.