2005: The number of completed 9×9 Sudoku squares is: 6,670,903,752,021,072,936,960.

2007: There exists a Sudoku puzzle with 17 clues that has a single solution, and there exists a 29 clues Sudoku puzzle with 2 distinct solutions.

2011: At least 17 clues are needed to ensure a single solution.

Sudoku has applications in many fields including agriculture, encryption and medicine.

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