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Portal Walkthrough - The Challenge Test Chambers - Test Chamber 17 (Least Time - 1:45)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 17 (Least Time - 1:27)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 15 (Least Time - 1:45)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 17 (Least Time - 2:20)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 17 (Least Portals - 4 Portals)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 17 (Least Steps - 150 Steps)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 17 (Least Steps - 175 Steps)
Portal Chamber 17 Least Time Gold 50 Sec.
Portal Walkthrough - Test Chamber #17
Portal Challenge Walkthrough Fling out takes Vol 5: Test Chamber 17
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 16 (Least Time - 0:52)
Portal Chamber 17 time challenge - Gold
