Logic Masters Deutschland e.V.

Yen Yarrow

(Published on 28. December 2025, 23:34 by someguy209)

This puzzle was originally made for one of Scojo's puzzle prompts, where we had to incorporate both Arrows and 10-Lines into a puzzle

Rules:

Sudoku: Place the digits 1-9 once each in every row, column, and box.

Yin yang: Shade some cells so that all unshaded cells are orthogonally connected, all shaded cells are orthogonally connected, and every 2x2 region has at least one shaded cell and at least one unshaded cell

Lines: Some lines cross over borders between shaded and unshaded cells. These borders divide the line into segments. Each line segment (or full line which stays entirely within one shading) follows one of two rules:
-Shaded line segments are "arrows" (a digit on one end of the line segment contains the sum of the other digits along the line segment
-Unshaded line segments are "10-lines" (the line segment can be further divided into sub segments where each sub segment contains digits that sum to 10).
(For the sake of clarity, note that one cell segments are not allowed.)

Kropki dots: Digits separated by a white dot are consecutive. Digits separated by a black dot are in a 1:2 ratio

Puzzle link

Example Image:

Puzzle Image:

Solution code: Column 6, with a / to indicate a change in shading. (i.e 12/3456/7/89)


Solved by aqjhs, Snookerfan, Piff, Fool on Hill, Starlight, ZornsLemon, Calesch
Full list

Comments

on 29. December 2025, 14:51 by Snookerfan
Awesome, pretty hard because of all the options and very enjoyable. Thanks!

Difficulty:4
Rating:N/A
Solved:7 times
Observed:0 times
ID:000QR1

Puzzle variant Shading puzzle

Enter solution

Solution code:

Login