SudokuHard

Hard Sudoku — Puzzle 87

217
68
46
528
819
234
716
324
8257

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.

218657439
796432185
453981726
341569278
527814693
869273514
975148362
632795841
184326957