Zipper Islands (Nurikabe)
(Published on 3. February 2026, 16:10 by gdc)
This is a puzzle that I set few months ago for sudoku adventure. You can watch a live solve by Rangsk here. Thanks fellow adventure setters for testing. Hope you enjoy!
Modified Nurikabe: Draw 3 lines of length 2 or more such that each circle is the center of one of these lines. The lines only move orthogonally and may not touch themselves or each other orthogonally. Each 2x2 must contain at least one cell on a line. Non-line cells form a single orthogonally connected area.
Zipper Islands: Digits an equal distance to the (circled) center of a line sum to its central digit.
Related Puzzle
if you liked this one, consider checking out the 9x9 version of this called Big Zipper Islands.
Solution code: Row 1 left to right (6 digits)
Comments
on 6. February 2026, 11:30 by gdc
add link to sequel
on 4. February 2026, 12:31 by Wuschel
Very nice, thank you!
on 4. February 2026, 12:11 by Franjo
Thank you very much for creating and sharing this lovely puzzle-snack.
on 3. February 2026, 21:10 by Exigus
Nice little snack. Thanks!
on 3. February 2026, 20:49 by dzamie
That was fun! Not very difficult, but still had to think in uncommon ways.
on 3. February 2026, 20:18 by sujoyku
Very cool twist on the Nurikabe ruleset! Thank you, gdc!
on 3. February 2026, 17:08 by SennyK
Really nice puzzle, clever rule, thank you for setting!
