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2019 · ClockStone Studios · Headup Games
Puzzle · Simulator · Strategy · Single player · ESRB E10+
Return to the Aperture Science Enrichment Center and experience a brand-new challenge. Finally, you are now able to not only construct bridges, but you can even place portals yourself!
The typical time comes from the diary. Per category, it is the median time reported by people who finished it and, without enough answers, the diary time.
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