Region Sum Quads / Region Summe Quads
(Published on 19. October 2022, 19:46 by PDN777)
Normal sudoku rules apply. The digits along a blue or pink region sum line must have the same sum in each 3x3 box entered by the line. Digits in a quadruple circle must appear in the surrounding cells. I think this puzzle is 1.5 stars out of 5 for difficulty for many solvers. As always, comments welcome. Thanks!
Click here to play on F-puzzles
Solution code: First row of puzzle, and fourth column of puzzle (read top to bottom). Enter as a string of 18 digits, no spaces.
Comments
on 12. March 2024, 11:37 by Miyao
The rules are attractive. But still if a demonstration about the sum line is given, it would be much easier for players to understand. I started with confusion and have to look at the comments and start playing with my guess. I'm not sure about the actual meaning of the rule until most blanks are filled. Ag thanks for the funny puzzle.
Btw, I would like to give a detail explanation of the rules for successors. There are two types or blue of pink lines (They follow identical rules, except for colors They are all three digits long). The first kind: the second and fourth lines at the bottom. Three digits are the same in the line. The second kind: other lines. They are arrows. (The sum of two digits in the same box is equal to the singleton digit in another box).
on 17. February 2024, 14:53 by PatMac
Very enjoyable. I repeated the same mistake several times through until I finally saw the error of my ways.
on 14. February 2024, 14:55 by One Eyed Man
Nice puzzle, very enjoyable solve. Thanks!!
on 11. January 2024, 00:47 by Michi122211
very satisfying throughout. And approachable even for a beginner solver. Thank you
** Thanks for the solve and kind comment! :-)
on 9. January 2024, 21:09 by Virux
Total magic. Lovely solve!
** Thanks so much for the solve and kind words. I hadn't looked at this grid for a while -- it's one of my favs... :-)
on 26. June 2023, 23:21 by Moses*
Very nice straight-forward puzzle with a steady flow of numbers.
Highly recommended for beginners.
Thanks PDN
** Thanks Moses!
on 3. November 2022, 16:11 by Nicholas Roberts
Nice and slick! Really enjoyed this one.
** yes, me too. I really like the way this puzzle flowed. :-)
on 23. October 2022, 05:46 by KyleBaran
Makes a good coffee break puzzle
** I’ll take it. :-)
on 20. October 2022, 19:48 by FlowStar
Very nice puzzle. Took me a second try to solve it. I had the same problem like sujoyku and did not see the 1-cell-region-line for some reason;)
** Yeah, the line visual symmetry actually rests in different positions in the boxes. Hence the one cell lines (in 3 boxes) appear in the lower shape; but not the upper shape.
on 20. October 2022, 11:59 by peep50183
Lovely :)
** Thanks! For some reason, I really enjoy the way this puzzle flows. :-)
on 19. October 2022, 23:12 by sujoyku
Thank you for this nice puzzle, PDN777! I kept on confusing a few sum lines with summation arrows (maybe my brain can not grasp the concept of a one-cell-long sum line ...) and thereby made it harder for myself.
After correct understanding of the rules, my solve was very smooth.
** Actually a region sum line with only one cell in a box is like an arrow.
