Sudoku #2249

Complexity: Hard

 Fun Fact About Sudoku
The first jigsaw puzzle was created in 1767 when John Spilsbury, an English cartographer, chopped up a wooden map of Britain and challenged the public to reassemble it. He called it a "dissected puzzle."

Enter numbers into the empty cells so that each row, column and 3x3 box contains the numbers 1 to 9.

7 3 5 2
4 8 7 1 3
9 6 4 8
5 7 4
3 6 1 9 2 7 4 8
3 1 5
5 9 8 2
1 9 6 5 7
7 1 6 9