Cave / Nurikabe
(Published on 1. November 2020, 16:50 by Jesper)
Cave puzzle: grey squares are walls; blue squares are cave (air); numbers in blue squares must be valid cave clues
Nurikabe: grey squares are land (part of islands); blue squares are rivers; numbers in grey squares must be valid nurikabe clues; unlike standard nurikabe, not each island needs to have a number clue
Detailed rules
- All blue squares must be orthogonally connected, but no 2x2 area may be completely blue
- An orthogonally connected area of grey squares is an island; islands with only one square are allowed
- Each island must connect orthogonally to an edge
- Islands may touch diagonally (in cases where this would not contradict the other rules), but not orthogonally
- An island may contain at most one number clue, and if an island contains a number clue, it must be equal to the size (number of squares) of the island
- A number in a blue square indicates how many blue squares can be seen from it orthogonally (including the square itself), given that grey squares obstruct the view
Example (6x6):
Penpa: Cave Nurikabe
The puzzle follows:
Solution code: The sizes of all islands, clockwise in order of attachment to the edge, starting top left (for the 6x6 example, the code would be 85114)
Comments
on 25. January 2024, 10:34 by Piatato
Wonderful!
on 17. August 2023, 19:41 by StephenR
Super fun, thanks. Nothing is incredibly difficult, there are just a lot of deductions to be made. Every time I thought I had run out of ideas I'd remember another one of the rules and it would help me on my way.
on 26. January 2023, 05:24 by wooferzfg
Beautiful puzzle, thank you
on 29. October 2022, 04:23 by ONeill
A brilliant construction, once again. Thanks!
on 17. September 2022, 23:35 by Christounet
Wow ! So fun to try something different once in a while. And what a lovely archipel that was ! The variety of logic that you managed to pour into each part of the grid is amazing. It felt like solving 4 different puzzles and getting a clue out of each solve to be able to reach the final code. A very nice ride all the way. Thanks+++
on 16. September 2022, 15:48 by Agent
Really cool puzzle. So many different types of logic.
on 4. July 2022, 07:04 by KNT
I definitely found this far more brutal than I should have- but a great hybrid. Thank you for another great puzzle, Jesper! Going through old puzzles of yours is always a pleasure for me. I will be sad when there are none left to do.
on 5. March 2022, 15:51 by ildiko
Erstaunlich, wieviel leichter - und eindeutig - das Rätsel wird, wenn man berücksichtigt, dass die Inseln am Rand liegen müssen. Tja, wer lesen kann...
on 20. November 2021, 13:16 by Joe Average
Großartig !
on 5. June 2021, 11:53 by tuace
Klasse!
on 17. December 2020, 18:32 by ffricke
Super schönes Rätsel !!
on 25. November 2020, 23:11 by Statistica
Klasse. Da hat ja jeder Bereich seinen eigenen Logik-Charme :-)
on 13. November 2020, 14:41 by Phistomefel
What a cool underwater cave! Thanks a lot for this beauty, Jesper!
on 7. November 2020, 07:38 by Roezaea
Fantastic puzzle! I found it very difficult but so satisfying to finish
on 4. November 2020, 10:48 by spxtr
Very fun!
on 3. November 2020, 06:07 by ArchonE
This was such a fun solve, and really made the most of the two variants. Thanks!
on 2. November 2020, 11:49 by cdwg2000
Super!
on 2. November 2020, 11:48 by ibag
Super! Und danke, r45, für den Tipp!
on 2. November 2020, 07:23 by r45
Na dran an der Höhlenvariante von ibag (ID 000337). Dadurch fiel es mir etwas leichter, es zu lösen. Sehr schön.
