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The 2020 Slice

Below are all the test chambers from PortalZ: The 2020 Slice, a pack of all the chambers ready for release from summer 2020.

To play The 2020 Slice:
  1. Download the necessary materials and sounds.

  2. Save all the the BSP files to one of these locations:
        Windows: C:\Program Files\Steam\steamapps\common\portal\portal\maps
        MacOS: ~/Library/Application Support/Steam/steamapps/common/portal/portal/maps
    (On Windows 64-bit, replace “Program Files” with “Program Files (x86)”.  On older versions of Steam, replace “common” with your Steam username.)

  3. Launch Portal.

  4. Select “Bonus Maps”.

  5. Select PortalZ: The 2020 Slice.
    (You can also open a specific chamber from the developer console by running "map z_2020_chamber_#", where "#" is the number of the chamber.)
Alternatively, you can download PortalZ: The First Slice from one of these external sites as a ZIP file and follow the included instructions:

Known issues in The 2020 Slice:
  • Reflections are not present on most/all reflective surfaces.
  • Cubes being pushed by antisoftlock panels in chamber 03 occasionally get stuck (but usually not in a way that makes the chamber unsolvable).
SelectionFile type iconFile nameDescriptionSizeRevisionTimeUser
SelectionFile type iconFile nameDescriptionSizeRevisionTimeUser
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Download		 Intro chamber (00) and tutorial chamber (01), based on the original Portal trailer.  4861k v. 4 Nov 4, 2020, 10:40 PM Zachary Yaro
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Download		 Test chamber 02. Portal device get!  2563k v. 3 Nov 4, 2020, 10:20 PM Zachary Yaro
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Download		 Test chamber 03.  “The little boxes will make you angry.”  2179k v. 3 Nov 4, 2020, 10:20 PM Zachary Yaro
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Download		 Test chamber 04. “The floor here will kill you; try to avoid it.”  4583k v. 4 Nov 4, 2020, 10:21 PM Zachary Yaro
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Download		 Skipping to test chamber 06. “Momentum, a function of mass and velocity, is conserved between portals.”  6727k v. 3 Nov 4, 2020, 10:21 PM Zachary Yaro
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Download		 Test chamber 07. Remember: In PortalZ, GLaDOS will never lie to you.  11636k v. 3 Nov 4, 2020, 10:21 PM Zachary Yaro
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Download		 Skipping again to test chamber 09. "Android hell is a real place..."   5791k v. 4 Nov 10, 2020, 12:44 PM Zachary Yaro
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Download		 Test chamber 10. “Up...down...up...down...up...”  3971k v. 3 Nov 4, 2020, 10:21 PM Zachary Yaro
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Download		 Test chamber 11. An introduction to on-demand gravity manipulation.  3638k v. 3 Nov 4, 2020, 10:21 PM Zachary Yaro
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Download		 Test chamber 12. More fun with gravity manipulation.  6242k v. 3 Nov 4, 2020, 10:21 PM Zachary Yaro
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Download		 Skipping to test chamber 14. Uninsulated electrical parts may be dangerous under certain conditions.   3694k v. 3 Nov 4, 2020, 10:22 PM Zachary Yaro
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Download		 Test chamber 17. DO NOT EUTHANIZE YOUR COMPANION CUBE.  2918k v. 3 Nov 4, 2020, 10:22 PM Zachary Yaro
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Download		 Test chamber 18. Puts Portal Peggle back in Portal.  2300k v. 3 Nov 4, 2020, 10:22 PM Zachary Yaro
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Download		 The final test. (And finale.)  6749k v. 3 Nov 4, 2020, 10:22 PM Zachary Yaro
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Download		 This file allows PortalZ: The 2020 Slice to show up in your bonus maps list.  1k v. 2 Nov 4, 2020, 6:00 AM Zachary Yaro