Somehow butterfly puzzles have been neglected in the past few months and it’s time to rectify. A quick reminder – this breed of overlapping sudoku puzzles was suggested by udosuk and implemented by myself.
There are 4 “classic” 9×9 Killer Sudoku puzzles inside this one. They all overlap and they all must be solved according to the rules of Sudoku. You can (in fact, you must) use the Twin Nonets solving technique for this one!
Have fun!
Extra special – Butterfly Killer Sudoku (hard).
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