SudokuHard

Hard Sudoku — Puzzle 17

21
6843
51
198
1597
42
923
634
965

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.

327195468
561284793
894637521
643751982
215869374
978423156
489512637
756348219
132976845