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Portal Walkthrough - The Challenge Test Chambers - Test Chamber 13 (Least Steps - 20 Steps)
Portal - Chamber 13 (least steps)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 13 (Least Steps - 10 Steps)
Portal Test Chamber 13: Using 4 portals ( Least Portals )
Portal Test Chamber 13 Least Steps Gold Run (9 Steps)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 14 (Least Steps - 10 Steps)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 15 (Least Steps - 75 Steps)
Portal - Chamber 13 (least portals)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 13 (Least Time - 0:30)
Portal Test Chamber 13 - 20 Seconds Achivement
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 17 (Least Steps - 150 Steps)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 16 (Least Steps - 70 Steps)
