Tag Archives: Twin Nonets

Flower Sudoku

Here is another Sudoku overlapping puzzle variation. This one was suggested again by udosuk, just like the butterfly puzzles. If you have seen Sudoku puzzles with this layout before – please let me know! There are 5 puzzles that heavily overlap each other – in fact the center (inner) grid is completely covered by the […]
Posted in Free sample puzzles, Samurai sudoku, Sudoku Variants | Also tagged , , , , | 7 Responses

Butterfly Sudoku Killer X

Here is this weekend’s special – a unique and never-seen-before Killer Butterfly X There are 4 “classic” 9×9 Sudoku puzzles inside this one. They all overlap and they all must be solved according to the rules of Sudoku and Killer Sudoku. You can use Twin Nonets solving technique for this one! However, in contrast with […]
Posted in Free sample puzzles, Killer Sudoku, Sudoku Variants | Also tagged , , , , , , , , , , , , , , | 4 Responses

Killer Butterfly

I don’t know if there is a species that go under that name and if there are, my apologies to them. Another world premiere Sudoku variation puzzle – Butterfly Killer Sudoku. Thanks to one of our regular visitors udosuk for suggesting this concept – this should encourage you to suggest a layout for overlapping puzzles […]
Posted in Free sample puzzles, Killer Sudoku, Sudoku Variants | Also tagged , , , , , , , , , , , , , , , | 4 Responses

Twin Nonets

Lets formalize the technique that can be used when solving overlapping puzzles, which I have been referring to as “the new solving technique” and that I now call Twin Nonets. Basically, this technique is a sub-technique (or if you like – a consequence) of the naked/hidden triplets technique that you are all probably aware of. […]
Posted in Solving tips | Also tagged , , , , , , , , | 12 Responses

Triple X

Another overlapping sudoku variant – now with 3 Sudoku X puzzles. Warning: This puzzle is quite difficult even that it can be solved using only basic sudoku solving techniques. You must work on all three puzzles in order to get the solution. Also, I think you might get confused about the “fourth” puzzle which you […]
Posted in Free sample puzzles, Sudoku Variants | Also tagged , , , , , , , , | 15 Responses
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