Printable Hard Sudoku

Set 1q5tf5x. 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 3 7 9
4 9 7 6 3
3 8 2 1
5 2 3
1 9 7
3 9 2 5
1
6 1 4
9 5
Hard #2
7 1
9 5
7 8 4 9
1 7 9 2 3
7 5 3 1
2 4 1
7 3 2 6 1 5
2 8
9
Hard #3
7 2 4 8
7 9 1 5 2 3
4 3 9
5 3 4
4 7 5 6
1 2 7
6 5
6 8 4
9
Hard #4
8 6 4
2 8
4 9 3
6 7 9 2
8 5 4 2 6 1
8 9
4 7 5
1 3
7 4 2 3
Hard #5
3 4 9 5
6 4 2 1
2 1
7 2 6
4 3 7 9 5
3 7
3
1 6 5
9 1 6 8 4
Hard #6
4 8
2 6 9
4 7 9
2 9 6 8 3
4 1
4 8 1 3
9 5 7 3
6
8 4 9 5 2
Hard #7
6 9 3
5
4 7 2 6
2 8
9 3 2 7
9 5 2 4 1 8
7 3 4 2
1 8
2 1 9
Hard #8
6 4 1
1 7 3 8 2
5 2 1 9 7
1 8
4 8
7 9 4
2 7 9 6
4 1 3
6 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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