Printable Hard Sudoku

Set qr4vey. 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 5 2 3 7 6
8 5 4
9 4
4 7 3
3 2 1 6
8 1 5
8 9
6 1 7 3
7 5
Hard #2
4 5
5 8 1
6 5 2 3
3 5 8
6 2 8 1
1 6 7 9 2
3 7
9 1 5
2 6 9
Hard #3
8 3 9
3 2 6 1 4
6 1
4 7 2
8 6
4 2 7 5 3
9 5 3
1 2 9
8 1 5
Hard #4
3 1 7 4 9
7 6 5 1
5 9 1 8
1 9 3
4
9 3 6 4
9 8
4 5 2
2 3 1
Hard #5
9 8 6
2 8 5 4
7 6
6 2 1
4 1 5 9 7
5 3 8
6 9 8 4
8 3 4 6
1
Hard #6
9 3 6
6 7
8 3 5 1 9
3 9
7 1 5 8
9 3 2 4
2 5
8 9 4 7
6 1 8
Hard #7
4 5 6 1
4 1 8
2 7
9 7 4 1 2
6 9 4
7 3 6 9
8 9
9 1 2
6 8 5
Hard #8
4 6 8
1 2 8 9
8 9 7 5
9 8 1
1 3 2 4
2 6 4 3
7
3 6 8
4 5 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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