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The First Slice

Below are the test chambers from PortalZ: The First Slice., the 2009 PortalZ beta prevew.

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

  2. Save all the BSP files and the BNS file below 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 First Slice.
    (You can also open a specific chamberfrom the developer console by running "map z_demo_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 First Slice:
  • Lighting is incomplete, missing, or may break in some chambers.
  • The door models in test chamber 10 sometimes disappear.  The doors are there, but will be completely white.
  • Chamber 05 is glitchy.  This is probably because Portal is not designed to do what I am trying to make it do the way I am trying to make it do it.
    • (Note from the future: This version of chamber 05 ended up being cut entirely, so feel free to just skip it.)
SelectionFile type iconFile nameDescriptionSizeRevisionTimeUser
SelectionFile type iconFile nameDescriptionSizeRevisionTimeUser
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Test chambers 00 and 01. This is an automated tutorial.   2603k v. 9 Nov 4, 2020, 5:57 AM Zachary Yaro
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Test chamber 02. Remember that you can use SHIFT to sprint!   1455k v. 9 Nov 4, 2020, 5:57 AM Zachary Yaro
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Test chamber 03. Warning: turrets are a lot more deadly and dangerous without the ASHPD.   1271k v. 9 Nov 4, 2020, 5:57 AM Zachary Yaro
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Test chamber 04. The floor here will kill you. Try to avoid it. Yes, I am evil.   2448k v. 9 Nov 4, 2020, 5:57 AM Zachary Yaro
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Test chamber 05. This is the only chamber that needs a bit more work (as far as I know) before launch. You may noclip just this once if you really have to.  1147k v. 8 Nov 4, 2020, 5:57 AM Zachary Yaro
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Test chamber 06. Hooray for momentum!   5171k v. 9 Nov 4, 2020, 5:57 AM Zachary Yaro
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Test chamber 07. If you thought just flinging alone gave you headaches...   2552k v. 9 Nov 4, 2020, 5:57 AM Zachary Yaro
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Demo test chamber 08. In the full version, this will be chamber 17. I am putting it in the demo because 1) the real chamber 08 is too buggy to be released and 2) the WCC is awesome. DO NOT EUTHANIZE YOUR FAITHFUL COMPANION CUBE!   1619k v. 9 Nov 4, 2020, 5:57 AM Zachary Yaro
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Test chamber 09. Welcome to android h**l.   2703k v. 9 Nov 4, 2020, 5:57 AM Zachary Yaro
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Test chamber 10. Just when you thought Portal could not get any more disorienting...   1426k v. 9 Nov 4, 2020, 5:57 AM Zachary Yaro
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This file allows PortalZ: The First Slice to show up in your bonus maps list.   1k v. 2 Nov 4, 2020, 6:00 AM Zachary Yaro