Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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