SudokuHard

Hard Sudoku — Puzzle 9

237
7243
681
31
139
298
1
8697
3684

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 27 given numbers and exactly one solution, so it can always be finished by reasoning alone.

524931768
198672453
367458192
639284517
481765329
275319846
912847635
846593271
753126984