==== LINKS ====
F-puzzles -
CtC app -
SudokuLab
==== RULES ====
Diagonal Sudoku rules apply : Fill the grid with digits 1 to 9 appearing each exactly once in every row, column, 3x3 box and marked diagonal.
==== ACKNOWLEDGEMENTS ====
Thanks a lot to many folks from the Cracking the Cryptic discord server, for the layout idea, good advices, and giving precious feedback on the puzzle.
Solution code: Digits from row 5 (left to right) and then column 6 (top to bottom). No space, 18 digits in total.