Sources
(Published on 21. February 2026, 08:00 by Kaktuslav)
Rules: Normal sudoku rules apply. If a cell with an arrow contains the digit N, then the straight line starting in that cell and extending N cells in the arrow’s direction (including the arrow cell) is a valid region sum line: it must cross at least one 3×3 box border, and box borders divide it into segments with equal digit sums.
E.g. if r1c1 = 5, then r1c1+r1c2+r1c3 = r1c4+r1c5.
Solution code: Column 6 (top to bottom)
Comments
on 26. February 2026, 21:04 by waxy
Awesome puzzle!
on 26. February 2026, 03:40 by Crusader175
Awesome logic!
on 22. February 2026, 21:27 by Exigus
Some fantastic logic from those arrows. Thanks!
on 22. February 2026, 14:50 by Firebird
Amazing puzzle! So many interesting deductions.
on 21. February 2026, 23:09 by Qodec
Magnificent!
on 21. February 2026, 16:39 by etoler
Absolutely phenomenal, as usual. So many moments felt impossible, until you realize that one trick or another tells you absolutely everything if only you can think of it. Definitely 4/5 on difficulty for me.
on 21. February 2026, 14:15 by eladv
Whow, that was cool! I took a couple guesses that worked out -- now I'm going to go back and do it the proper way :)
on 21. February 2026, 14:01 by Krisonium
Brutal and devilish but pretty neat and fun! Thank you for setting the puzzle.
