Nurikabe Killer Sudoku
(Published on 26. December 2020, 16:33 by udukos)
Rules of the puzzle:
1. Normal Sudoku rules apply.
2. Shade/ fill in the cells under following rules.
3. You cannot shade/ fill in cells containing numbers in their top left corner.
4. The digit in the cell with a number in their top left corner tells the number of contiguous white cells i.e. it represents a Nurikabe clue.
5. The number in the top left corner represent killer clues that tells the sum of all the digits in that white area. Numbers cannot repeat within a white area.
6. Each area of white cells is separated by black cells.
7. The black cells are linked to be a continuous wall. Black cells cannot be linked to be 2x2 square or larger.
8. All the Nurikabe clues have been given.
Note the inequality sign in the grid of the main puzzle.
Also note that, as is the norm with killer sudoku, the cell with the number in their top left corner might not be the leftmost cell of the highest row of that white area.
Here is an example on a 6x6 grid for illustration:
Now for the puzzle. It is also available online via Penpa plus.
Good luck. Have fun.
Solution code: Row 7 Column 3
Comments
on 28. October 2022, 14:54 by ddx2407
Thank you, udukos, for a wonderful puzzle.
The solve was very interesting and non-trivial.
Loved it!
on 25. October 2022, 17:33 by Playmaker6174
Phew that was hard, but I adore the wonderful logic and the interactions in this one, the part near the end was especially tricky but the nurikabe logic helped me a lot there :)
on 12. September 2022, 15:48 by Agent
Great construction with a very tight solution path. Even after all the islands were placed, it was hard to believe that the sudoku would resolve.
on 11. September 2022, 18:44 by KNT
love finding these older gems
on 2. January 2021, 20:46 by udukos
Thank you everyone for the wonderful feedback! :)
on 2. January 2021, 05:26 by RockyRoer
Thanks so much for the example puzzle. I wouldn’t have tried it if not for that. Kinda like nurikabe, might have to try more of those in the future!
on 31. December 2020, 09:19 by Phistomefel
This was a fun solve with some very tricky steps. Well done setting this, udukos!
on 28. December 2020, 01:01 by Yohann
Great puzzle. The combination of rulesets works well and the puzzle is very nicely set. Thank you @udukos
on 27. December 2020, 15:58 by udukos
@cdwg2000 @MartinR @SudokuExplorer Thank you for the nice feedback. :)
on 27. December 2020, 03:05 by SudokuExplorer
Wonderful!! I really enjoyed the logic and highly recommend trying it :-)
on 27. December 2020, 01:43 by MartinR
Rulesets nicely intertwined and tricky to the end.
on 27. December 2020, 01:30 by cdwg2000
Very beautiful design and problem-solving path. I like it very much. Thank you for your patient clarification!
on 26. December 2020, 23:41 by cdwg2000
@udukos
Thank you for your clarification. I made a mistake. I think it is a very good variant.
on 26. December 2020, 23:39 by udukos
This is my first time posting a puzzle based on Nurikabe. Please let me know if any of the rules of the puzzle are not clear. I would appreciate the feedback.
on 26. December 2020, 17:31 by udukos
Updated description
on 26. December 2020, 17:11 by harrison
Are all of the Nurikabe/Killer Sudoku clues already given? Or is it possible we might need to find more cages later?
@harrison Yes, all the nurikabe/killer sudoku clues are given. I will add that in the description.Thank you for pointing that out.
