Battlefield Sudoku - Ring Theory
(Published on 4. July 2020, 23:21 by DiMono)
Normal Sudoku rules apply. Additionally, Battlefield rules apply:
Consider the first X cells and the last Y cells of a row or column where X is the number in the first cell and Y is the number in the last cell. A clue outside the grid gives the sum of the digits where these groups overlap, or the sum of the digits in the gap between the groups if they don't overlap.
One last note: there is a logical solution path for this puzzle. If you're near the beginning and already relying on trial and error, you're missing something.
Solution code: Column 5 and column 6
Comments
on 16. December 2022, 21:25 by StephenR
Very nice, thanks. Remember enjoying a battlefield sudoku a while ago, possibly also by DiMono, and this proves it wasn't a fluke. Interesting ruleset.
on 19. October 2021, 18:55 by PixelPlucker
Wonderful! Not too tricky, and the logic was always clear and enjoyable to ponder.
on 10. July 2020, 01:37 by DiMono
Revised the expected difficulty to Very Hard, to reflect the fact that so few people have solved it, and most of those who have done so were unable to find the logical solution path.
on 7. July 2020, 00:07 by Nylimb
Very nice puzzle!
@Nylimb Thanks!
on 6. July 2020, 16:57 by DiMono
Added note of there being a logical solution path, so trial and error is unnecessary early on.
on 5. July 2020, 09:17 by Big Tiger
Well, I don't know if there was a convenient trick to it, but enough slogging through "Can it be this? - No" eventually led me to the solution!
on 5. July 2020, 00:34 by Jesper
Very enjoyable!
on 4. July 2020, 23:22 by DiMono
Added solve link to Penpa
