Printable Hard Sudoku

Set 1663qq8. 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
7
5 3 6 4 9 2
4 6 9
6 1 2 3
9 3
2 5 6
3 9 1
9 8 5 7
2 1 4
Hard #2
3
5 6 4
3 4 5 2 9
7 5 6
5 2 9 3
8 5
9 8 4 7 5 2
8 1
7 9 6
Hard #3
7 8
3 4 1 7
1 7 2 9 4
4
3 2 7 4
5 9 8
4 6 1 3 2
2 5
9 6 8
Hard #4
9 6
9 1 4
7 9 5 6
9 5
5 3 2 1
9 4 5 1 8 7
3 7 6 9 5
8 2 7
Hard #5
5 4 8 1
1 3 2
4 8 3 7
9
3 8 4 9 1 2
5 7
3 9 8
9 5
8 5 7 1
Hard #6
4
8
4 1 7 6 5 9
2 5 1 3
9 4
8 4 9 2
1 9 5 2
2 9 3 7 4
3 2
Hard #7
8
9 5 1 4
1 7 2 8 5
4 8 1 7
3 6 7 9
4 6 9
9 5 2
5 3 1
7 4
Hard #8
2 8
2 8 1
4 8 9 7
3 4 6
1 9 3
9 6 8 7
6 3 4 9
6 5 8 4
1 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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