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Portal Walkthrough - The Challenge Test Chambers - Test Chamber 18 (Least Portals - 25 Portals)
Portal Test Chamber 18: Using 16 portals ( Least Portals )
Guide: Portal Least Steps Challenge (Test Chamber 18)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 18 (Least Steps - 150 Steps)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 18 (Least Time - 2:10)
Portal - Chamber 18 - Least Portals Challenge - 4 portals
Test Chamber 18 Least Portals Gold.
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 18 (Least Steps - 85 Steps)
Portal Challenges: Least Steps
PORTAL - challenge chamber 18 - least portals - gameplay - part 51
Portal - Advanced Chamber 18 - Speedrun Route
Portal: Challenge-map - Chamber 17 (Least Portals)
