Now, this is something else. https://www.quaddicted.com/reviews/ter_shibboleth.html by https://www.quaddicted.com/reviews/?filtered=ORL
An episode with five huge, experimental levels in unique settings and texture themes: a beach resort under a Golden Gate Bridge, a puzzle map set in an industrial storage facility, an Asian temple, a twisted otherworldly fortress, and a western mining town.
The levels exceed various engine limits and need to be played with the included developer version of Quakespasm.
Additional screenshots courtesy of Breezeep: https://i.imgur.com/dHwyUx3.png https://i.imgur.com/exr8Kof.png https://i.imgur.com/pYZPaOJ.png