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  2. List of Portal 2 chambers - Portal Wiki

    theportalwiki.com/wiki/List_of_Portal_2_chambers

    Triple Laser | Chapter 4 - Test Chamber 20 Jail Break - Escape | Chapter 4 - Escaping GLaDOS' Test Shaft - Parts 1 & 2 (Test Chambers 21 & 22) Chapter 5 : The Escape