Portal 2
Valve
The "Perpetual Testing Initiative" has been expanded to allow you to design co-op puzzles for you and your friends!
Steam
Overview
Looking for a brain game in the Puzzle Games category? Zophos by Dimitris Efthymiou is available for Steam.
Screenshots
About this game
Zophos is a classic survival horror inspired by the old generation of the genre. After a car crash, John wakes up lost in a foggy, abandoned place and searches for help—only to realize something is still here, watching.
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