Eight Xs (XV sudoku)
(Published on 19. November 2020, 01:00 by Lisztes)
Normal Sudoku rules apply. Each row, column, and 3x3 box contains each number from 1 to 9 exactly once.
All orthogonally adjacent cells with the sum of 5 are marked with a V, and with the sum of 10 are marked with an X. This is also a negative constraint (where there is no V or X between the cells, the sum of the 2 cells is not 5 or 10)!
Killer Sudoku rules apply. The sum of all numbers in a cage (marked with dashed lines) must match the small number printed in its corner. No number appears more than once in a cage.
The puzzle is also available online.
Solution code: Row 9 and Column 8
Comments
on 14. October 2024, 22:32 by LeaVulpina
Very nice! Tough, for sure, but definitely doable.
on 19. October 2023, 20:23 by ICHTUES
Yes. I can only agree with Florian.
on 19. October 2023, 20:23 by Florian Wortmann
fun collab solve :-)
on 26. November 2020, 09:09 by Statistica
Very nice and very hard. I liked it!
on 25. November 2020, 16:27 by PrimeWeasel
I can see the logic with the cages after I'd finished it, but not during the solve. Retracing and changing all the X's and V's to make it fit afterwards wasn't particularly fun for me, but I might just be too frustrated for spending too much time on it.
on 25. November 2020, 10:55 by Lisztes
@Ragna Don't be sorry, I admit, it's not easy, but you don't have to use bifurcation, to solve it, I promise.
on 25. November 2020, 01:12 by Ragna
Sorry, I cannot find the intrance. So I have T&E, many bifurcations. Not very amusing. Not smooth.
And as I see, only 5 persons could solve it since a week. I'll give up. Sorry :-(
on 20. November 2020, 13:37 by Lisztes
Changing the difficulty level from average to hard.
Apparently it is not as easy as I thought.
on 19. November 2020, 19:49 by Aquashockz
Yes he didnt miss anything. Beautiful logic to this puzzle! Thank you for creating and sharing your puzzle!
on 19. November 2020, 19:34 by PrimeWeasel
Are you sure you're not missing an X or V?
~dammit what am I missing
