Printable Hard Sudoku

Set jugnb5. 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
2 5 3 1
7 4
5 6
4 1 9 7 8 5
7 8
8 3 1 9
3 2
3 7 6
4 8 9 7
Hard #2
4 9 7
7 2 3
4 2
1 5 9
3 8 5
8 7 4 1
5 2 4
2 3 1 5
1 9 5 2
Hard #3
5 6 7
9 4 5
4 1 6
9 4 1 5
1 9 7 8
7 5 9
2 8 7
1 8
7 5 1 6
Hard #4
7 9
5 1 3 2 4 8
3 4 1 2
9 5 4
3
4 5 9 8 1
6 8 1 4 9 5
9 7
Hard #5
2 5
9 6 4
3 2 4 8 9
2 6
1 5 8
2 7 3
1 2 8 3
8 6 9 4
2 9 1
Hard #6
8 3 2 9 4
7 5 2
1 8
4 9
7 1 5 6
6 2
3 7 5 4 1
6 4 3
2 9 8
Hard #7
6 9
4 9 8 7 1
2 6
3 5 9
8 9 5
3 5 2 6
9 7 3 1
8 9
2 1 4 5
Hard #8
3 2 5 8
7 9 3 5
3 1 2
1 8 9
7 9 1 5 4
6 5
4 7 8 1 6 9
9 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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