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definitions and information are taken from Rohan Rao blog & Sudopedia

Also known as Hypersudoku, Windoku, NRC-Sudoku, Four-square Sudoku
Rules:
Place numbers in the grid such that every row, column and 3x3 box contain the numbers 1 to 9. Each of the four yellow 3x3 boxes must also contain the numbers 1 to 9.

Inserire i numeri in modo che ogni riga, colonna, settore contenga i numeri da 1 a 9. Anche ciascuno dei 4 settori gialli deve contenere i numeri da 1 a 9

Although there are only 4 additional boxes shown, the position of these 4 boxes indirectly creates 5 additional constraint zones. These are shown in the following picture with different colors.
Sebbene siano indicati solo 4 settori addizionali, la loro posizione crea indirettamente 5 zone addizionali che devono contenere i numeri da 1 a 9. Queste zone sono indicate nella figura seguente con colori differenti


Solution