Sudoku — Challenge 3
seniorbraingames.orgInstructions: Fill the grid so every row, column, and 3×3 box contains the numbers 1–9.
Level: hard
3
2
6
9
3
5
1
1
8
6
4
8
1
2
9
7
8
6
7
8
2
2
6
9
5
8
2
3
9
5
1
3
Answer Key
4
8
3
9
2
1
6
5
7
9
6
7
3
4
5
8
2
1
2
5
1
8
7
6
4
9
3
5
4
8
1
3
2
9
7
6
7
2
9
5
6
4
1
3
8
1
3
6
7
9
8
2
4
5
3
7
2
6
8
9
5
1
4
8
1
4
2
5
3
7
6
9
6
9
5
4
1
7
3
8
2