Printable Hard Sudoku

Set 1qbx7ak. 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
4 3 5 7
7 8 4
6 4 9
8 9 6 2
2 5 8 7
7 5
1 2 9
4 3 7
2 5 1
Hard #2
7 3 5 9
1 6 4
6 8 7 9
6 5 4 8
3 5 6 1
9
7 8 1 5 2
1
3 8 4
Hard #3
6 5 9
8 7 9 1 3
7 4 6
9 7 2 8
2
6 1 3 9
1 9 2
2 6 1 8
5 3
Hard #4
2 6 4 9 3
4 2
7 3 2 4 1
8 1
6 3 9 5
2 1 8
9 3
8 7 9
9 4 7
Hard #5
2 4 1
8 7 1 3 6
3 8 5 2
2 3 1
5 3 6 4 7
4 2 7
5 6
4
3 1 2
Hard #6
8 9 2
4 9 5 6
3 7 9 4
7 6 2 9
5 2
9 1 3 5
3 8 5
2 7 3 8
6
Hard #7
5 4
4 6 5 9
3 1 2
5 2 4 6
6 1 3
8 2 7
8 6
7 2 1 5
9 7 8 2
Hard #8
6 7
2 7 3 6 8 5
1 5
5 3 8 2 7
1 8
4 2 3 8
7 6 9
9 1 4 7 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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