Sudoku #2709

Level: Hard

 Fun Fact About 2
Wayne Gould, New Zealander and retired Hong Kong judge, calls himself the stepfather of Sudoku. He stumbled upon a Sudoku book in Tokyo while vacationing there.

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

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