Try the puzzle on the SudokuPad app by Sven Neumann.
Hint: Firstly, determine the sum or possible sums of each region sum line. Then, determine the higher and lower end of the between lines. Box 8 is the key.
Solution code: Row 1, from left to right.
on 21. May 2025, 22:21 by sahi1l
I liked it a lot, thanks!
on 21. May 2025, 09:04 by lcy.30
Corrected the mistyped rule.
on 21. May 2025, 09:03 by lcy.30
Corrected the mistyped rule.
on 21. May 2025, 08:58 by StefanSch
There is a wrong description of "Region sum lines".
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