Printable Hard Sudoku

Set 10tsh8o. 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
8 1
5 2 6 9 8 3
6 1 4 9
6 4 7
8 3 9
3 6 5
4 7
2 3 8
8 1 5
Hard #2
5 2 9
6 2 4
2 9 8 3 1
5 6 9
6 8 5
3 4
7 1
1 8 5 4
4 7 6 3
Hard #3
6 9 8
1 6 3
8 2 3 7
7 2 4 3
3 5 7
2 7 1 4
4 6
7 2 4 1
2 1
Hard #4
4 7 2 5
2 5 7 9 3
9 6 7
5 1 4 8 3
4 3 6
5 9 1
8 2 6 3 5
1
Hard #5
9 8 1 4 7
2 9
5 4
4 5
6 7 3
3 8 6 2
7 6 5
3 6 2 5
4 5 8 1
Hard #6
8 4
7 2 1 4
1 3 9 7
1 6 2
6 2 3
8 1 3
3 4 5 8
8 9
1 2 7 6
Hard #7
9
8 1 7
9 2 5
1 2 9 3 6
7 1 9
5 8 1
5 4
6 4 8 1
2 6 8 5 9
Hard #8
8 1 9
7 3 6
9 4 2 3
3 2
4 7 8
2 1 7 8
1 9
9 2 4 1
6 3 5 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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