In Development·Unknown
Portal 2
The "Perpetual Testing Initiative" has been expanded to allow you to design co-op puzzles for you and your friends!
posted byKKaalePaapa
Developed by Valve
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The "Perpetual Testing Initiative" has been expanded to allow you to design co-op puzzles for you and your friends!
Listed Aug 24, 2026
A community-added listing for Portal 2 by Valve.
Developer: Valve
Official website: https://www.thinkwithportals.com/
Store page: https://store.steampowered.com/app/620/Portal_2/