SudokuHard

Hard Sudoku — Puzzle 137

9481
715
62
64
9
87452
694
763
917

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.

943687251
721359468
586412793
239568174
615274839
874931526
167823945
458796312
392145687