“I think this one is quite difficult” – is what I would be tempted to say if I didn’t have such an army of intrepid solvers for audience. So, I won’t say that. See for yourself and let me know what you think about this killer butterfly puzzle.
Butterfly Killer Sudoku
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After a quick reminder on Butterflies, this took me about 20 minutes. So, not that difficult! You are always going to get extra clues which limit the options once you have a few placements in outer nonets. r16 options were very quickly filled in. Still fun to do – thanks.
Definitely fun, I really enjoyed it. One note though – the solution would not download for me, clicking on it (using a Firefox browser) just returns back to the main page.
I agree — I tend to find it difficult at first adjusting to a Butterfly, then the rest is rather mechanical. But fun anyway.