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Portal Walkthrough - The Challenge Test Chambers - Test Chamber 18 (Least Steps - 85 Steps)
Guide: Portal Least Steps Challenge (Test Chamber 18)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 18 (Least Steps - 150 Steps)
Portal Chamber Challenge 18 - Least Steps
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 18 (Least Portals - 25 Portals)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 18 (Least Time - 2:10)
Portal Walkthrough - The Challenge Test Chambers - Test Chamber 17 (Least Steps - 150 Steps)
Portal - Testchamber 18 Walkthrough (v2)
Portal Chamber 18 - 21 Steps
Portal Walkthrough - The Advanced Test Chambers - Test Chamber 18
Portal Test Chamber 18: Using 16 portals ( Least Portals )
Test Chamber 18 Least Portals Gold.
