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Now, this is something else. Ter Shibboleth by KenChennar alias 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: 1 2 3