**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!

(click to download or right-click to save the image!) | |

**To see the solution to this puzzle**click here

Have fun!

## 7 Comments

I’ve tried downloading this puzzle a few times but all I get is an ordinary killer. Love all your overlapping killers and clueless killers and can’t get enough of them!

Hi Sandra,

not sure why you are getting an ordinary killer. Look carefully – it’s a 12×12 puzzle, not 9×9.

4 sub-puzzles overlap heavily so you may not have noticed that it’s a butterfly…

Thanks. With only half a brain how do I cope? With a large bag of erasers and lots of time!

Hello, all I can see is a grid without numbers; am I missing something ?

CdV

July 28 is definitely “hard”. After 6 hours of studying, I must not understand the clue on twin nonets, N8

ok, got July 28, as usual more than one way to skin the cat, and I was making it harder than it needed to be, aloha

Loved the July 28th Butterfly Killer Sudoku. Hoping you will do another one soon.

Denny