Sudoku!!!!

Fill the boxes with numbers and letters. In each row, each column and each region must be present numbers and letters without repetition. Difficulty level selectable: - the possibility of adding the letters A to G with you numbers - possibility of changing the playing field structure - Infinite puzzles created by the game itself Riempi le caselle con numeri e lettere. In ogni riga, in ogni colonna e in ogni regione devono essere presenti numeri e lettere senza ripetizioni. Livello di difficoltà ...