Rules:
Normal sudoku rules apply.
Region Sum Lines: Digits on a blue line have the same sum in each 3x3 box the line passes through. If a line passes through a box multiple times, each individual segment sums separately.
Solve online:
Solution code: Row 4
on 21. July 2025, 18:26 by StephenR
Smashing puzzle, thanks.
on 12. March 2025, 06:33 by waffles_the_dog
A really challenging puzzle, none of the individual deductions were overwhelmingly difficult, but they were consistent almost all the way to the end. Very nice. Thank you!
on 8. March 2025, 12:54 by nordloc
Beautiful!
on 8. March 2025, 11:36 by askaksaksask
This is so well constructed. The way the geometry forces the solver to suss out the clarity is really something wonderful. The interactions are so rich. Brilliant puzzle. Thank you!
on 7. March 2025, 16:50 by byeler
Amazing puzzle!
Even when you ask the right question and get the right answer, there are still more big questions to ask and it doesn't necessarily mean the rest of the solve will be a breeze
on 7. March 2025, 15:39 by Visumation
Very nice. It took me a little while to spot the implication of the math. But when I had the right thoughts, it flowed beautifully. Thanks a lot for setting and sharing.
on 7. March 2025, 13:50 by keenbowl
Wonderful puzzle, but quite tough for me, thanks for setting&sharing!
on 7. March 2025, 13:05 by Snookerfan
Very nice! I found it quite hard, but very beautiful. Thank you
on 7. March 2025, 10:24 by Piatato
Excellent! I never quite dare to believe that one can do such cool things with RSL, but you keep proving me wrong! :-D
on 7. March 2025, 06:12 by therealsillypenguin
Great puzzle. Felt like I was on the cusp of a break in for quite a while before I finally got there
on 7. March 2025, 03:32 by rameshsrivats
Quite a brilliant puzzle. But smooth and fast if you ask the right questions at the start.
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