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I think Sudoku can be very fun to play with new rules, when you begin thinking in higher abstractions. I'm a big fan of anti-knight rules.

I look forward everyday to see what new puzzles are out on the Cracking-the-cryptic channel.

IMO, your use of the word 'satisfying' is to me the definition of fun!

Negative constraints like anti-knight significantly improve my enjoyment of Sudoku. They make it more likely that puzzles don't devolve to straight Sudoku near the end.

On my phone, I've got 566 hours logged in 7700 games. I think it's fun :)

Isn't it a bit presumptuous to assume that it is “never” fun to play just because you don't find it fun?

I think regular sudoku is fun.