Printable Hard Sudoku

Set 1556itz. 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
7 9 3 4
6 9 1 7
3 2 1
7 4 8
8 6 1 9 2
8 3
5 7
7 1 8 3
3 5
Hard #2
4 8 2 3
2 7
3 6 5 4 1
5
2 1 6 5 3
8 1 6
3 2 8 1
5 1 9
9 7
Hard #3
5 4 7
5 4 9 6
6 2 3
7
5 4 2 8 3 6 9
6 2
4 8 1
1 5 3 4
6 5
Hard #4
7 4 8
1
6 8 2 3
5 3 1 2
7 2 3 4 5
9 4
6 9 4 7 8
8 6 9 5 2
Hard #5
5 2 1
6 8 4
7 3 6
3 2 5 4
6 7 9
8 5
3 1 6 7
6 4 3 2 8
2 1
Hard #6
9 7 6
1 2 4
7 3 8 1
1 8 6
4 3 5 9
8 2 7 4
2 5 7
5
7 4 6 2
Hard #7
7 6
6 4 2 8
2 4 7
1 6 2
3 4 9
3 5
2 6 7
9 4 5 1 2
6 8 1 9
Hard #8
2 1
4 6 2 9 8 1
5 8 2
2 9 5
1 6 7
1 3
9 5 4 6
7 6 8 9
6 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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