Rules:
Place the digits 1-9 once each into every row, column, and box.
Adjacent digits along an orange Dutch Whisper line differ by at least 4.
Box borders divide a blue Region Sum line into segments with the same sum.
Different Region Sum lines may have different sums.
Have fun solving!
Solution code: Row 1
on 20. February 2026, 07:08 by davidz32z
Really good looking puzzle and a very nice break in! This hit 4 starts for me, I had to bifurcate at around the midpoint
on 15. February 2026, 23:22 by FIT7Y
Fixed the link