SudokuHard

Hard Sudoku — Puzzle 179

2469
172
5
451
852
7829
8563
34
15

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.

872146395
194357286
365298741
248539617
913674852
657821934
721985463
539462178
486713529