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Erich's Puzzle Palace
via jbranchaud@gmail.com
https://erich-friedman.github.io/puzzle/index.html
This is the kind of site that the internet was created for. A little HTML, a little CSS, a repeating puzzle piece background. Beautiful.
~~Here is another cool puzzle site that I found linked from the Interactive links: [redacted link]~~
Update: the interactive versions of the puzzles that this page links to seem to have been taken over by ad-based redirects, so don't bother clicking through to the interactive links for any of those puzzles.