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Re:Ask HN: What is your favorite internet rabbit hole? by wbhart on Monday October 24, 2016 @02:46PM (#12781612)
http://www.themastertheorem.com/

It's a puzzle solving website. It isn't updated very regularly nowadays, but all the old "Theorems" are still there.

Re:Ask HN: What is your favorite internet rabbit hole? by blackbeard334 on Tuesday October 25, 2016 @03:17AM (#12785899)