Standard sudoku rules apply.
Anti-knight rules apply: no two cells in the grid a chess knight's move apart may contain the same digit.
Numbers outside the grid intersect to reveal the locations of given digits within the grid. For example, if the clues outside rows 1 and 5 and columns 2 and 7 contain 4s, then there is a 4 at two of R1C2, R5C2, R1C7, and R5C7. In other words, the clues outside the grid combine to describe pre-defined x-wings and swordfishes. Visual example below and at solve link.
Solution code: Row 1, Column 3
on 22. October 2023, 04:25 by DiMono
Fixed puzzle link
on 8. February 2021, 09:29 by streetspirit
brutal. i needed multiple attempts over several weeks to get this, but damn if i don't feel a massive sense of achievement.
@streetspirit Thanks for sticking with it! I'm glad you enjoyed it enough to keep going.
on 12. November 2020, 07:27 by Luigi
Definitely not difficult to solve.
Straight solving path.
Nice puzzle variant!
on 12. November 2020, 05:23 by DiMono
Increased difficulty due to lack of solves
on 8. November 2020, 12:50 by Tom1i
I like this variant. Not too difficult even for beginners at variant sudoku, yet presenting little challenges along the way. Loved both this and the last one.
@Tom1i Thanks. It seems I may be making these for a very small audience, based on the relative lack of solves between the two of them. Glad you're among them.