Sudoku Medium 1

The first Sudoku puzzle appears to be completed with handwritten numbers. The numbers are: 2, 1, 8, 6, 9, 5, 7, 4, 3; 6, 8, 9, 1, 7, 2, 5, 4, 3; 4, 6, 3, 5, 8, 9, 1, 7, 2; 5, 9, 7, 4, 3, 1, 6, 8, 2; 8, 5, 1, 7, 2, 6, 3, 9, 4; 3, 4, 2, 8, 9, 5, 7, 1, 6; 1, 7, 4, 9, 6, 3, 2, 5, 8; 9, 2, 6, 3, 5, 7, 4, 8, 1; 5, 3, 8, 1, 4, 2, 9, 6, 7.