Logic Masters Deutschland e.V.

Siamese Coral (1)

(Published on 6. March 2023, 02:36 by KNT)

Two corals are to be drawn in the grid: each coral is orthogonally connected, contains no 2x2 area, and does not 'lock in' any cells; that is, for each coral, all orthogonally connected groups of cells that do not belong to itself are orthogonally connected to the boundary. The corals may not have any cells in common.

One of the two corals is entirely comprised of numbers from 1 to 9, and no numbers may be placed elsewhere in the grid. Numbers must not repeat in any row or column. Clues outside the grid indicate the sums of connected groups of numbers in the respective row or column, where cells not on the number-coral serve as delimeters between groups. The sums are given in ascending order, not order of appearance.

Clues to the right and bottom indicate the lengths of coral segments for one of the two corals, in ascending order. Different rows and columns may provide information on different corals, but no row or column contains information mixed from both corals.

A question mark can replace any number from 0 to 9, but no clue may have a leading zero.

SudokuPad

penpa+

Solution code: Row 3, Column 9: K for empty coral, X for neither coral, otherwise the digit

Last changed on on 20. July 2024, 04:05

Solved by polar, Xendari, Koalagator2, Niverio, Piatato, Vebby, Jesper, ONeill, jkuo7, wooferzfg, Jakhob, rmn, Myxo, ClashCode, ancarro, lerroyy, Statistica, Alex, RJBlarmo, thoughtbyte, Uhu, MaizeGator, cha, ... ibag, ascension, misko, peacherwu2, Martijn314, akamchinjir, Gliperal, Agent, pkp, ffricke, zuzanina, akodi, wildbush7, Christounet, kiwi0710, Paletron, Nick Smirnov, puzzler05, Las4one, h5663454
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Comments

on 16. November 2023, 00:31 by Christounet
Very enjoyable "training" puzzle ! Now let's see what we can do with that giant invading siamese coral...

on 6. July 2023, 07:59 by akodi
Beautiful construction! Challenging, but all the steps are clear and logical, absolutely no trial and error needed.
Love it and will now see if I can tackle that monster...

on 20. May 2023, 07:13 by Agent
Lovely puzzle, very satisfying flow!

on 25. April 2023, 21:43 by peacherwu2
Almost missed this beautiful gem!!!

on 7. April 2023, 20:36 by ibag
Wundervoll!

Last changed on 28. March 2023, 04:47

on 28. March 2023, 04:47 by tallcat
Turns out that remembering all the rules definitely helps a solve progress faster. That being said, this is far out of my comfort zone so i certainly feel the 5/5 difficulty is warranted. It kept me engrossed though!

on 20. March 2023, 15:47 by KNT
@AnnaTh Thank you for the lovely compliment :) I am personally very surprised this puzzle ended up as 5 stars, I listed it (and still think) it is a 4. However the follow up is surely much more challenging. Sometimes I wish for more possible ratings for difficulty..

on 20. March 2023, 15:41 by AnnaTh
Beautiful! And not as difficult as I feared it would be. Nevertheless challenging!

on 17. March 2023, 16:47 by Uhu
I'm stunned. Wow!

on 8. March 2023, 05:58 by wooferzfg
Awesome puzzle, that was a ton of fun. Thanks for including an example so I didn't have to parse every detail in the story :)

on 6. March 2023, 20:19 by ONeill
Awesome introduction to the ruleset. It will definitely help to prepare for what’s to come :)

on 6. March 2023, 18:07 by Jesper
Fascinating ruleset! I found this 'intro'-puzzle already quite challenging, so I suspect the monster one will put up a good fight :)

on 6. March 2023, 13:25 by Piatato
Awesome ruleset, and a great puzzle!

on 6. March 2023, 09:09 by Niverio
Stop breaking my brain pls

on 6. March 2023, 03:41 by Xendari
Very cool & very weird. Loved it!

on 6. March 2023, 03:13 by polar
Very fun puzzle! I see a lot of potential for this ruleset on a bigger grid :)

Difficulty:5
Rating:100 %
Solved:48 times
Observed:4 times
ID:000D6I

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Solution code:

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