Yes, you're not mistaken - these are given digits! When I published the first puzzle featuring the "ions" rule, I realized that it's so restrictive that it could work in a "classic" sudoku, and indeed it works very well. As always, I appreciate your ratings and comments.
Rules:
Lösungscode: Row 9
am 26. November 2025, 12:44 Uhr von Snookerfan
Lovely! I really like this constraint and I am getting better at applying it by practice. Thank you
am 11. November 2025, 16:14 Uhr von apendleton
What a fun construction!