Main article: Portal 2 Dual Pit Experiment (15 ) (Bronze) How to Obtain: Complete the same test twice. TipsEdit This achievement/trophy is unlocked through story progression, so a proper guide is unnecessary.. Categories: Portal 2 Portal PC Role Playing Game Valve Achievements Trophies Xbox 360 Puzzle Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.
) (Bronze)
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