SudokuHard

Hard Sudoku — Puzzle 272

78
1253
5918
92
827
678
591
849
16

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.

437865921
981724563
256391874
394517286
815246397
672983415
768459132
523178649
149632758