SudokuHard

Hard Sudoku — Puzzle 277

8
319
26
28
9768
5792
4192
13
2789

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.

674285913
831964275
295371468
162548397
943726581
587139642
419853726
758692134
326417859