Is this Sudoku or Nurikabe?
(Published on 27. December 2025, 23:18 by FollowerOJ)
=> Standard Sudoku rules apply
=> White dots symbolize a difference of one
=> All given digits are Nurikabe clues
=> Nurikabe:
> Shade every cell either island or river such that all river cells form a single orthogonally connected path and no 2x2 is completely river.
> Each number clue indicates the size of it's island. Each island has exactly one clue.
> Islands can't touch orthogonally.
> All possible Nurikabe clues are given
=> Nurikabe Islands are Killer Islands (Digits on island might repeat and sum to one of the totals pencilmarked at the nurikabe clue. Each available total is only to be used as one island total)
=> The Nurikabe river is divided into killer segments by box borders.
=> Each killer segment sums to one of the following totals, each total is only to be used the indicated amount of times:
1x7, 1x8,3x9, 1x13,1x17, 1x20, 1x21, 1x24, 2x42
Solution code: The sums of the ambigous islands from left to right and top>down and r1 of box 3 from left to right the Totals of the islands that can take multiple values in the following order: r5c1, r7c3, r8c5, r3c7, r6c9 r9c9 and then just row1 of box 3 from left to right
Comments
on 8. January 2026, 18:50 by jordanza
What in the world is that solution code. I solved the puzzle but that code is just too much for me.
The puzzle was wonderful though.
on 7. January 2026, 15:05 by monaters
It shouldn't be harder to figure out the solution code rules than the puzzle itself... the puzzle was spectacular, though
on 1. January 2026, 16:30 by cornuto
Ist dir bei der Auflistung der Summenkanäle evtl ein Fehler unterlaufen? Die Summe 8 ist mehrfach vorhanden (1x8 und 3x8). Soll es vielleicht 3x9 heißen? Spannende Nurikabe-Variante. Vielen Dank dafür.
on 30. December 2025, 01:50 by dzamie
Nurikabe sudokus are always so pleasant to solve, the greens and blues of my islands and rivers gradually spreading through the grid.
Very awkward solution code. If you revisit nurikabe or similar style of puzzles, it may be easier to go for something like "rows 4 and 5, but only the digits on islands." Checks that the nurikabe was solved and also plays well with sudokupad's copy-cells button.
on 29. December 2025, 19:00 by Starlight
Entered it now. It was a fun puzzle. Great work on it
on 28. December 2025, 09:19 by FollowerOJ
Made entering the solution code to hard again so some adjustment in the wording, might it help
on 28. December 2025, 09:16 by FollowerOJ
As I seem to have troubles picking good solution Codes it should be the Totals of the islands that can take multiple values in the following order: r5c1, r7c3, r8c5, r3c7, r6c9 r9c9 and then just row1 of box 3 from left to right
on 28. December 2025, 05:20 by Starlight
I'm having trouble entering the solution. Not sure what I'm doing wrong
