You can give the puzzle a go in F-puzzles here
Solution code: Columns 1 and 9
on 19. July 2024, 10:10 by mezkur7 Sudokupad: https://sudokupad.app/y9q5de9mmu
on 6. November 2020, 06:16 by cdwg2000 Very hard,thanks.
Solution code:
stay loggedin
register - forgot password