SudokuHard

Hard Sudoku — Puzzle 188

59
723
6218
93
643
29
481
7159
392

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.

123598647
768412935
495673218
936854172
872961453
541327896
654239781
287145369
319786524