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Portal Chamber 18 - 21 Steps
Portal walkthrough - Test Chamber 18 (Advanced)
Guide: Portal Least Steps Challenge (Test Chamber 18)
Portal Chamber Challenge 18 - Least Steps
Portal | Test Chamber 18 | "Hard Drive Method"
Portal - Chamber 18 Least Time - 0 seconds
Portal - Chamber 18 Least Steps - 0 steps
Portal: Chamber 18 Speedrun Routes
Portal Gold Medals - Least Steps Chambers 13-18
Platform Skip in Chamber 18 - Portal Speedrunning
All Gold Medals Portal Tutorial - Chamber 18
Portal Chamber 18 OOB
