Logic Masters Deutschland e.V.

Regional Yajilin Sudoku

(Published on 7. December 2024, 12:23 by Myxo)

This puzzle is a combination of Irregular Sudoku, Regional Yajilin and Fortress. I opted to go for a minimal grid without given digits, thus the Irregular Sudoku is quite challenging. Enjoy!


Rules:

Irregular 0-8 Sudoku: Place the digits 0-8 exactly once in each row, column and region.

Regional Yajilin: Shade some cells of the grid such that no two shaded cells share an edge. Draw a single closed loop (without intersections or crossings) through all unshaded cells. A digit in a circle indicates the number of shaded cells in that region.

All circles must contain different digits.

Fortress: Digits in shaded cells must be greater than any of their orthogonal neighbors.


CtC-App

Solution code: row 6


Solved by dumediat, Paletron, ONeill, Dragonslayer, totem_mapr, han233ing, SKORP17, tuturitu, TripleABattery, smckinley, Al Fresco, Piatato, Mr_tn, Counterfeitly, Isael, Joyofrandomness, Clara123, madhupt, ... feverlute, MaizeGator, dogfarts, Bellsita, koXx, OJPS, samjna0049, petecavcc, jkuo7, Dharmabum, cyddrdrd, dennischen, redfoot, karlmortenlunna, Andrewsarchus, wisty, Qodec, PippoForte, misko
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Comments

on 29. June 2025, 14:59 by Qodec
Can't believe how well this resolves. Very impressed.

Last changed on 29. June 2025, 12:58

on 29. June 2025, 12:56 by wisty
Really cool construction, but damn, fortress is hard. I suspect some of the irregular techniques and short chains I used weren't remotely necessary, if I'm to believe Oneill's comment that it was smooth for them xD

on 21. January 2025, 01:57 by petecavcc
very nice and very hard!

on 13. December 2024, 20:26 by rmm466ss
Wonderful puzzle! The irregular grid was perfect for this variant.

on 11. December 2024, 12:37 by MagnusJosefsson
Great puzzle, very enjoyable!

on 10. December 2024, 13:38 by madhupt
The Yajilin part was straight enough but the sudoku part was really tough, but only up to a point after which the puzzle really unfolded. Thanks for sharing this.

Last changed on 8. December 2024, 11:45

on 8. December 2024, 11:43 by Piatato
Very impressive construction! The sudoku part went a bit more slowly for me than the yajilin, but it was all fair and interesting!

on 7. December 2024, 16:13 by Dragonslayer
Yajilin part is very easy. Irregular+fortress part is full of tricks and is pretty good!

on 7. December 2024, 14:25 by ONeill
Cool! the irregular was pretty smooth for me :)

on 7. December 2024, 12:47 by dumediat
Lots of fun, incredible that this resolves uniquely! :)

Difficulty:4
Rating:95 %
Solved:41 times
Observed:9 times
ID:000L1A

Variant combination Online solving tool Irregular grid

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Solution code:

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