Normal sudoku rules apply.
Circles contain digits which are consecutive with a digit a chess knight's move away.
Squares contain digits which are in a 1:2 ratio with a digit a chess knight's move away.
Every circle and square permitted in the puzzle has been given including where clues overlap.
Solution code: row 8
on 14. August 2023, 16:20 by MartinR
Quite nice, once the breaking is found, the negative constraints are quite powerful
on 12. August 2023, 16:38 by Bankey
That was fun! Thanks, @ Scruffamudda :).
on 12. August 2023, 12:31 by ymhsbmbesitwf
Fantastic puzzle! It's a little time consuming, but very satisfying and not too difficult.