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Valve

Portal 2

  • PC
  • Linux
The "Perpetual Testing Initiative" has been expanded to allow you to design co-op puzzles for you and your friends!
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About Portal 2

The "Perpetual Testing Initiative" has been expanded to allow you to design co-op puzzles for you and your friends!

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Developer sauce · ValvePortal 2 - UpdateUpdate · Sep 29, 2026 · Sauce Developer sauce · ValvePortal 2 - UpdateUpdate · Jun 29, 2026 · Sauce Developer sauce · ValvePortal 2 - UpdateUpdate · Jun 26, 2026 · Sauce Developer sauce · ValvePortal 2 - UpdateUpdate · Feb 5, 2025 · Sauce Developer sauce · ValvePortal 2 - UpdateUpdate · Jan 20, 2025 · Sauce

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