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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:
  • Turret AI is sometimes completely unresponsive.  I do not know why this happens for some people; I hope to have time to patch this issue specifically.
  • 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).
  • If you try, you can softlock yourself in chamber 10 by using a cube to push yourself into the button that unlocks the third room and jumping through the door just before it closes.
  • If you try, you can softlock yourself in chamber 11 by squeezing yourself into the pit under the moving panel in the final room before lowering it.
SelectionFile type iconFile nameDescriptionSizeRevisionTimeUser
SelectionFile type iconFile nameDescriptionSizeRevisionTimeUser
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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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Test chamber 02. Portal device get!  2563k v. 3 Nov 4, 2020, 10:20 PM Zachary Yaro
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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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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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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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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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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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Test chamber 10. “Up...down...up...down...up...”  3971k v. 3 Nov 4, 2020, 10:21 PM Zachary Yaro
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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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Test chamber 12. More fun with gravity manipulation.  6242k v. 3 Nov 4, 2020, 10:21 PM Zachary Yaro
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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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Test chamber 17. DO NOT EUTHANIZE YOUR COMPANION CUBE.  2918k v. 3 Nov 4, 2020, 10:22 PM Zachary Yaro
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Test chamber 18. Puts Portal Peggle back in Portal.  2300k v. 3 Nov 4, 2020, 10:22 PM Zachary Yaro
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The final test. (And finale.)  6749k v. 3 Nov 4, 2020, 10:22 PM Zachary Yaro
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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