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definitions and information are taken from Rohan Rao blog & Sudopedia

Origin: from a idea of our friend SAYAN (Daniele).
da un idea di SAYAN (Daniele).
Rules:
Place numbers in the grid such that each row, column and 3x3 box contain the numbers 1 to 9. The content of a cell where we have orizzontally the <> is equal to the sum or difference of adjacent cells in the row; the content of a cell where we have vertically the <> is equal to the sum or difference of adjacent cells in the column .

Inserire i numeri in modo che ogni riga, colonna, settore contenga i numeri da 1 a 9. Il contenuto di una cella in cui compaiono in orizzontale i segni <> è uguale alla somma o differenza delle celle adiacenti nella riga. Il contenuto di una cella in cui compaiono in verticale i segni <> è uguale alla somma o differenza delle celle adiacenti nella colonna.



Solution