

It’s an enormously prolific community, to the point where it can be hard to know where to begin expanding your Aperture adventures.

The majority of these are singleplayer chambers (although that still leaves over 100,000 cooperative chambers if you and a buddy have got a lifetime to kill). Since Portal 2 made its debut in April 2011, the community has designed more than half a million custom test-chambers, with dozens of new chambers being added every day.
