Originally made as a puzzle hunt with story elements for the DDLC ARG Club Discord server. The site has since then been made standalone, and can be played to completion as is (There may be a few references, and the "story" is vaguely tied to the server).
The puzzles were made for a target audience, so the difficulty curve may seem arbitrary to others, but no knowledge of DDLC is needed if you just want some puzzles.