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definitions and information are taken from Rohan Rao blog & Sudopedia

Also known as Untouchable, Touchless
Rules:
Place numbers in the grid such that each row, column and 3x3 box contain the numbers 1 to 9. Cells with the same digits could not touch even diagonally.

Inserire i numeri in modo che ogni riga, colonna, settore contenga i numeri da 1 a 9. Celle con lo stesso numero non si possono toccare nemmeno diagonalmente.



Solution