Logic Masters Deutschland e.V.

Black or White Coral

(Published on 27. May 2024, 03:47 by KNT)

A coral is to be drawn in the grid: the coral is orthogonally connected, contains no 2x2 area, and does not 'lock in' any cells; that is, all orthogonally connected groups of non-coral cells are orthogonally connected to the boundary.

Clues outside the grid give the lengths of either non-coral or coral segments in the row or column. Where clues are given, they are complete, but not necessarily in the correct order. No row or column contains clues for both non-coral and coral segments at once (this does not necessarily mean the possible non-coral and coral clues for any row or column must be different).

SudokuPad

penpa+

Solution code: The sizes of the areas outside the coral, clockwise, starting from the top left. X for any area greater or equal to 10.

Last changed on on 11. June 2024, 21:58

Solved by Tom-dz, nuzzopa, wooferzfg, Jesper, Piatato, tuturitu, Christounet, jkuo7, Niverio, Snookerfan, ONeill, Greg, Luigi, Paletron, Agent, Koalagator2, RJBlarmo, MagnusJosefsson, abed hawila, TheZwierz, ... BBB, Myxo, madhupt, AnnaTh, Playmaker6174, JustinTucker, Statistica, johnyzzh, aliciaprobably, Alex, nottabird, Uhu, wisty, zzw, OGRussHood, uvo, ibag, CHalb, Nick Smirnov, SPREVVIE, LeiZ123321
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Comments

on 13. June 2024, 23:47 by wisty
Really great shading puzzle practice with a lovely variety of logic! Thank you so much!

on 30. May 2024, 11:47 by Playmaker6174
Delightful puzzle throughout! I really liked the usages of connectivity logic in this one :)

on 29. May 2024, 19:08 by madhupt
Another wonderful puzzle by KNT. Starts off beautifully and then one has to really wade through the logic to reach a very satisfying solution. Thanks for sharing.

Last changed on 28. May 2024, 21:01

on 28. May 2024, 21:01 by BBB
3-star for me. It’s my first time playing a coral and I found it not that hard.

on 27. May 2024, 18:45 by Agent
Excellent!

on 27. May 2024, 15:56 by ONeill
I’m normally pretty bad at coral but this flowed nicely, thanks

on 27. May 2024, 15:54 by Snookerfan
Great and original puzzle! Thank you

on 27. May 2024, 13:47 by Niverio
Beautiful logic!

on 27. May 2024, 11:35 by Christounet
So, it is happening ! Nice :)

on 27. May 2024, 10:38 by Piatato
Fun and very smooth!

on 27. May 2024, 08:45 by wooferzfg
Very fun, thanks

on 27. May 2024, 04:10 by KNT
Clarified solution code.

Difficulty:4
Rating:98 %
Solved:45 times
Observed:4 times
ID:000I8R

Enter solution

Solution code:

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