Islands in the Stream (Nurikabe)
(Published on 8. October 2025, 20:26 by sujoyku)
I like to thank all testers and wish you joyful solving!
Rules:
- Normal sudoku rules apply, i.e. each row, column, and 3x3 region has to contain the digits from 1 to 9 once each.
- Nurikabe: Shade all cells either blue (water) or green (land) such that all water cells are orthogonally connected and form no 2x2 areas. Each area of orthogonally connected green cells is called an island.
- Island Size Squares: A cell with a square must be land and its digit counts the number of cells in its island. Each island must contain at least one square.
- Water Sweeper Circles: A cell with a circle must be water and its digit counts the number of water cells in the 3x3 area around the clue, including itself.
- Up to Land sums: A clue outside a row or column indicates the sum of all digits in water cells up to the first land cell. (The digit in that land cell is not included in the sum.)
Here you can solve the puzzle online:
Solution code: Digits in water cells in Row 4 from left to right
Comments
yesterday, 22:15 by Olive
Great puzzle! Thank you :-)
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You are much welcome, Olive, thank you for your comment!
I am glad that you liked the puzzle.
Kind regards, sujoyku
on 9. October 2025, 17:36 by monaters
Great puzzle! I also appreciate the solution code being simple. It's frustrating flipping between multiple tabs to enter complicated solution codes.
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Thank you for your comment, monaters! I am glad that you enjoyed the puzzle.
Kind regards, sujoyku
on 9. October 2025, 14:31 by Visumation
Very cool puzzle. Congrats on your first nurikabe.
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Thank you, Visumation! It is great to hear you liked it.
Kind regards, sujoyku
on 9. October 2025, 13:07 by Franjo
Als erklärter Nurikabe-Fan musste ich mich daran versuchen. Und wurde nicht enttäuscht. Die up-to-Variante funktioniert hervorragend hier. Einmal mehr: Heißen Dank für das tolle Puzzle, sujoyku.
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Sehr gern geschehen, Franjo, vielen Dank für deinen Kommentar! Es ist toll zu hören, dass Dir mein Nurikabe gefallen hat.
Herzliche Grüße, sujoyku
on 9. October 2025, 10:07 by wuc
The 3* hit me several times. Awesome puzzle. Great math deductions. Great fun thx.
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You are much welcome, wuc, thank you for commenting! I am glad that you liked it and enjoyed the mathy deductions.
Kind regards, sujoyku
on 9. October 2025, 10:05 by Snookerfan
Brilliant puzzle! I love nurikabe and the up-to-sum added a beautiful new layer of logic. Well deserved very high rating. Thank you
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You are much welcome, Snookerfan, thank you for your comment! I am glad you enjoyed this up to-flavoured Nurikabe.
Kind regards, sujoyku
on 9. October 2025, 00:31 by Nordy
Very fun puzzle! Especially smooth if you have Nurikabe experience (unfortunately I was slow to spot some very straightforward steps)
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Thank you for your comment, Nordy! It is great to hear you had a fun solve. It was lovely to watch you and Calvinball solve it.
Kind regards, sujoyku
on 8. October 2025, 22:20 by Christounet
Seems very easy at first, but there are a couple of deductions that require a bit of thinking. Very pleasant! Thanks :)
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You are much welcome, Christounet, thank you for your comment! I am glad that you liked the puzzle.
Kind regards, sujoyku
on 8. October 2025, 20:37 by Calvinball
A very well put together puzzle, it made great usage of all of it's different parts. Thank you sujoyku!
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You are much welcome, Calvinball, thank you for your comment! I am glad you enjoyed it.
Kind regards, sujoyku
