The letters and question marks in the clues are to be replaced with digits in the range 0-9. Same letters denote same digits, different letters denote different digits. Question marks are not restricted in this way. Leading zeroes in double-digit numbers are not allowed.
Solution code: Columns 6 and 7, - for a black square
on 17. June 2020, 08:15 by AnnaTh
Schön! Und wohltuend in der aktuellen Flut von Sudoku Rätseln ;-)
on 14. June 2020, 20:28 by marcmees
very nice
on 13. June 2020, 08:32 by Mody
Absolut nicht so leicht, wie es auf den ersten Blick aussah ;)
on 12. June 2020, 16:36 by ibag
Schöner Erstling!