Build your own co-op test chamber in Portal 2 for PC
You can now create co-op test chambers in Portal 2, thanks to a new update Valve released for PC.
The chambers can be built using the game's puzzle maker. The update also implements a Quick Play feature that reveals the best user-made maps in different categories.
Valve is also giving current users a 75 percent-off discount on Portal 2, so you can invite someone new to play with you.
Since the Steam Workshop launched in May, over 170,000 single-player chambers have been made with the game's internal editor, the Perpetual Testing Intiative.
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