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How do I play these maps? Press the Subscribe to all button below this description. Then start up your Portal 2 and go to Community Test Chambers ► Play Single Player Chambers, select one of the UNREAL CHAMBER maps form the list and press Play.
How does this even work? These maps were made in the Hammer world editor. They use linked_portal_door entities to make the impossible geometry work. Read more about how it works here. To create maps with Hammer, you have to download Portal 2 Authoring Tools in the Steam tools section.
How do you upload your maps to the workshop? You can upload your map with the p2map_publish.exe tool located in Steam/SteamApps/common/Portal 2/bin.
How do you create custom thumbnails? When you upload a map with p2map_publish.exe you can select a custom thumbnail.
Please make more! I do from time to time, but there are no fixed release dates for maps.