SudokuHard

Hard Sudoku — Puzzle 199

63
278
574
47159
92
31
6384
752
76

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.

481679325
257834196
936512748
624781539
815493267
793256814
569328471
348167952
172945683