SudokuHard

Hard Sudoku — Puzzle 181

64
612
7125
425
234
8637
793
389
1

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.

692475138
358961742
741283965
425317896
179628354
863594271
587149623
214736589
936852417