SudokuHard

Hard Sudoku — Puzzle 270

52
17
518
86
296
798
3259
56284
13

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.

614583927
298176534
573492186
145867293
832941675
769235418
321754869
956328741
487619352