Printable Hard Sudoku

Set vu915b. 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 7 9 2 1
8 2 4 6
3 7 1 8
7 2 4 3 5
3
6
8 1 9 7
2 4 8
9 3
Hard #2
9 3 7 8
5
1 8 9 3
4 7 8 6 1
7 5 2
8 1 9 4
2 5 4
8 2 9 6
7
Hard #3
3 5 4 9
4 2
3 2
9 6 7 3
8 9 1
1 6 9 7
9 4
8 5
6 4 9 1 3 2
Hard #4
9 3 7 6
8 2 1 5
4 3
1 2 6 3 4
1
6 3 7
5 8 9
8 4 1
2 4 1 8
Hard #5
3 5 2 7
5 2 9
2 1 6 3
1 7 4
4 3 8 6
4 2 5 8 6 1
9 2 5
4 9
Hard #6
6 1 7 4
4 6
2 8 7 4
1 8 4
5 1 3
8 2 1
2 1 3
3 8
9 3 5 4 6
Hard #7
7 9 2
5 9
2 7 4 1
2 8 1 3
4
9 5 8 6
5 3 6 4 1
1 3 7
6 9 3
Hard #8
3 4 8 9 7
2 5 1 9
9
1
9 4 7
8 3 2 5
4 9 3
1 5 3 4
7 8 5 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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