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Portal Challenge Chamber 18 Least Steps (75)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 18 (Least Steps - 150 Steps)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 15 (Least Steps - 75 Steps)
Portal - Chamber 15 (least steps)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 18 (Least Time - 1:13)
Portal Challenge Chamber 17 Least Steps (132)
PORTAL - challenge chamber 15 - least steps - gameplay - part 43
Portal Chamber 16 Least Steps (19 steps only)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 13 (Least Steps - 20 Steps)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 16 (Least Steps - 40 Steps)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 17 (Least Steps - 215 Steps)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 13 (Least Steps - 10 Steps)
