SudokuHard

Hard Sudoku — Puzzle 223

837
1946
291
4832
957
3165
28
413

How to play

Fill every row, every column and every 3 by 3 box with the numbers 1 to 9, using each number once.

This puzzle has 26 given numbers and exactly one solution, so it can always be finished by reasoning alone.

683917245
192458637
457362891
546783912
928541376
371629458
719236584
864195723
235874169