Printable Hard Sudoku

Set i6mbx6. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
9 5 7
6 8 2 5 7 1
1 8 6
3 8 4 5
7
2 9
9 4 1 8
7 6 2 4
8 3
Hard #2
3 1 5 7 9
7 3
4 7 3
2 6
7 4 1 8 6
2 9
2 8 5 6
3 1 2
9 3 4
Hard #3
5 1 4 6
2 8 1 7
9 4 7 1
4 5 7 3 2
3 5 8 1
1 9
3 9 8 4
5 6
Hard #4
5 4 8
1 9 2
2 6 4 1 5 7
6 4 2
3 6 9
8 9 1
9 8 7
2 1 7
8 5
Hard #5
2 6
8 9 5 7
4 3 2 8
8 9 7 3 6
6 3 7
1 2
2 5 1 9
4 8 3
3 1
Hard #6
8 1 7 9
5 3 9 8 7
3 4 2
7 3 2
8 9 5 7 1
3 4
5
2 7 9
8 5 3
Hard #7
4 3 5 8
7 4 9
2 8 6
3 1 6 2
8 5
3 6
8 5 1
1 6 8 3 5
9 4 7
Hard #8
4 7 3
2
9 2 5
6 4 3 8
5 1
2 1 3
9 7 4 2
2 1 4 6 7
4 2 1 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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