Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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