SudokuHard

Hard Sudoku — Puzzle 243

7284
8641
52
3178
8
6951
865
43
51

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.

167529843
928364751
354178629
431792586
285641937
679853214
743286195
896415372
512937468