Printable Hard Sudoku

Set n4r20i. 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 2 9 7
9 5 7 1
7 9 4
4 2 6
4 5 1
5
2 1 7 9 6
6 3 8
5 3 9
Hard #2
7 2 6
9 1 7 8
3 2
8 4 1
7 5
3 1 5 2 9
9 7 8 4
2 3
4 8 6 9
Hard #3
5 4 8 7 1
2 3
1 7 9
6 7
4 6 1 9
3 9 1
3 1 5
1 2 8
3 5 6 7
Hard #4
7 3 8 9 4
6
5 9 8 3 2
7 2 1 5
6 2 4
4
5 3 6 9 2
4 8 1
9 8
Hard #5
4 6 8 2
6 7 5 3
3 8 2 4
7 9 5
4 5 3 6 7 9
1
9 7 8 3
1 2 5
Hard #6
2 3 8 9
9 6 3
1 3 7 8
5 1 3 4 2
4 3
1 4 2 6
6 7
9 7 6
9 1
Hard #7
4 1 3
4 2 8 5
8
4 3
7 1 3 8 9 6
8 1 6 7
1 9 5 3 8 2 4
6 2
Hard #8
9 7 8 1
1 3 8 9
8 2 9 5
9 2 6 8
1 7 5
6
5 3
4 1 7 9 6
2 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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