Printable Hard Sudoku

Set 1z12zg. 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
5 6 7 1 9
9 4 7
2
6 5 2 1 3
8 7 9 6
6 3 4 9
5 8 3 1 2
8 6
Hard #2
9 4 5 3
7 1 2
1 9 6
7 9 4 8 3
4 1 7
2 6 9 5 1
1 9
2
4 2 8
Hard #3
2 3 1
4 5 6 2
9 6 5
2 6 7
8 2 3 1
4 5 9
3 8 6 7
2 9 4 1
1
Hard #4
1 7 3 8
9 3
3 6 5 2 4
6 3 1
8 4 6
8 2
9 6 2
7 9 6 1 8
5 7
Hard #5
4 6 8 2 5
5 2 6
3 4 9
3 2 5
7 5 8
8 4 3 6
4 8
9 2 4
4 9 7
Hard #6
5 7 6 4
1 4 2 9
9 6 2 7
2 9 7 8 5
4 8
4 9 2
2 8 5
5 6 1 3
Hard #7
7 5 4
8 3 6 9
6 5 3 7 1
1 9 2
7 8 1 4
4 2 6 5
9 5
9 4 6 2
Hard #8
5 1
2 8
3 5 1 6 4
7 1
2
9 3 2 8 1 7 5
6 5 1 4
2 6 8
5 7 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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