I've seen what I'd consider harder puzzles/riddles online.
I know DevArt set up a crude chat-room based one, where you go from room to room solving puzzles (of course it was based on NP. I believe level 3 was Morse Code).
I remember getting to "don't be so negative" and eventualy getting past it and a few more levels. I wouldn't have the time to try again. My mind's disconnected enough as it is.
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