Printable Hard Sudoku

Set 1qrms0. 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
1 6 2 4
5 2 7 1
6 8
3 5
4 9 7 6
9 4 5 3
9 8 1 7
8 6 3 4
Hard #2
2 8 4 7
9 3 4 2
2
2 1 9 5
8 6 1 4
6 5 3
9 5 4 6 8
2 7 6 5
Hard #3
1 2 5
5 9 2 7 4
4 3
6 3 8
9 5 2 4
7 5 2
9 6 7
5 3 1 9
1 3
Hard #4
6 7 8
3 1 6
9 4 3 2
1 3 9 5
3 6 8
2 4 9 6
6 7 5
2 4 1
5 7
Hard #5
1 7 2
6 4 1 2
8 6
1 4 2 5
7 9 1
5 4 6
6 9 3
2 9 3
1 8 4 7
Hard #6
6 1 4 5
2 6
3 2 7 4
6
3 8 1 2
5 4 2 3 1
2 6 5 8 3
1 8 7
4
Hard #7
6 7 5
2 4 8
8 6
6 9 4 2
2 5 4
3 4 6
6 8 9 1 2
8 1 9
7 5 6
Hard #8
4 8 6
1 2 7
9 4 5 8
5 3 9 6 1 7
1 7 2 3
7 4
4 8
7 9 6
6 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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