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Portal Walkthrough - The Challenge Test Chambers - Test Chamber 17 (Least Time - 2:20)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 17 (Least Time - 1:45)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 17 (Least Steps - 150 Steps)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 17 (Least Steps - 215 Steps)
Portal Challenge Walkthrough Fling out takes Vol 6: Test Chamber 17 Part 2
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 18 (Least Portals - 25 Portals)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 14 (Least Time - 0:50)
Portal - Test Chamber 17 - 81 seconds
Portal Chamber 17 time challenge - Gold
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 16 (Least Steps - 70 Steps)
Portal Walkthrough: Test Chambers 14 - 16
Portal Gold Medals - Least Time Chambers 13-18
