SudokuHard

Hard Sudoku — Puzzle 260

52
386
651
476
3894
42
1
647
82693

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.

634185729
915372846
728964351
479253168
253816974
186749235
592638417
361497582
847521693