F-puzzles - CtC app - SudokuLab - Penpa+
==== RULES ====
Normal Sudoku rules apply : fill the grid with digits 1 to 9 appearing each exactly once in every row, column and 3x3 box.
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Thanks to HakaNN , Evil German and Niverio for early testing !
Solution code: Digits from Row 3 and then Row 9, from left ro right. 18 digits in total, without space characters.
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