Printable Hard Sudoku

Set nlmc1p. 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
6 5 9 4 7 3
4 7 1
1 8
9 2
2 3 6
4 5 6
3 5 2
8 6 7 1
1 9 4
Hard #2
4 6 7 3 1
2 3 8 7
2 5
5 1 4
3 7 5
7 6 3 4
4 5 8
5 1 9 7 3
Hard #3
8 4 5 2
5 3 9
3 2 7
9 4 7 8 3
6
1 6 2 9
1
2 7 4 6
5 8 6 4
Hard #4
7 5 6 9 8
9 5
4 3 7
3
1 9 5 4 8
7 1
5 6 4
8 1 2 4 3 6
6 5
Hard #5
2 7 1
1 3 7
4 9 8
5 8 2
2 3 6 7
1 8 3 7 4 5
3 6 8
5 6
1 5
Hard #6
7 3 5
1 5 8 3
9 8
4 9
3 2 8
2 7 1 3
7 9 4 1
6 1 3 7
4 7 6
Hard #7
6
3 2 7 6 5
6 2 4
4 1 7
8 3 9 6 2
7
7 6 5 8
8 3 9
9 5 1 6
Hard #8
7 6 9
6 5 2 8
5 7 9 3
4 2 7
9 8 6 4
2 3 5 1
8 4
2 1 3
6 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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