Rules:
Sudoku: Place the digits 1-9 exactly once in each row, column and box.
The grey lines in the grid are either German Whisper lines, Entropic lines, or both. Each individual line may be of a different type. Lines do not branch, and do not turn at overlaps with other lines (ie. whenever two lines overlap, they go straight through).
German Whisper lines: Adjacent digits along a German Whisper line have a difference of at least 5.
Entropic lines: Every sequence of three adjacent digits along an Entropic line must contain one digit from 1,2,3, one digit from 4,5,6 and one digit from 7,8,9.
Inequalities: Inequality signs between two cells point towards the smaller digit.
Solution code: Row 2
on 13. January 2026, 19:52 by Bankey
Amazing puzzle. Thanks, @ Myxo :).
on 5. December 2023, 14:16 by Silverstep
Bite-sized, no difficult step. Enjoyable for mid-level solvers (e.g. my mom). Not sure how this ended up on the 5-star list -- was it featured by Simon or Mark at some point?
5/5 for the beauty rating, as usual
on 1. October 2023, 19:41 by samuel1997
Brilliant! A lot of stunning and reasonable logic in it!
on 17. September 2023, 09:01 by Piatato
Cool puzzle, thanks! Fun interactions throughout the solve :)
on 17. September 2023, 02:09 by Krokant
Nachdem ich mich endlich entschieden hatte, mit wie vielen Farben das Ganze koloriert werden soll, ging es etwas einfacher voran. :)
Schönes Rätsel.
on 16. September 2023, 22:52 by Playmaker6174
Fascinating puzzle throughout! Sticking with which way to notate the parity was quite head-scratching but luckily I didn't run into trouble for so long.
Particularly I enjoyed the logic around box 5 and especially the long wiggle line in box 7-8 :)
on 16. September 2023, 20:04 by RedBarchetta
Great break in, fun logic, and what I thought was an average puzzle near the beginning turned out to be very challenging till the end. Great puzzle!
on 16. September 2023, 19:13 by BHUNTER47
Excellent puzzle.
on 16. September 2023, 07:59 by dennischen
Brilliant and approachable, thanks for the puzzle!
on 15. September 2023, 11:51 by thoughtbyte
Ambiguity puzzles hurt my brain, but this one was very smooth. Great combination for ambiguity, beautifully executed. Thanks!
on 15. September 2023, 10:48 by MicroStudy
i'm putting this on my facebouq page!! awesome!!!