SudokuHard

Hard Sudoku — Puzzle 253

2
615893
51
423
35
2196
879
23
368

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.

549312876
761458923
832967514
974685231
618273495
325194687
186749352
257836149
493521768