Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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