Printable Hard Sudoku

Set 8t136s. 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 3
5 6 7 9 3
9 4 8 7
1 7 3
7 9 4 1
2 5
1 8 2 6
2 4
9 3 1
Hard #2
3 1
4 2
8 7 5
9 8
7 8 5 3
9 4 6 5 2
9
8 5 6 2 3
3 6 5 2 9
Hard #3
7 3 4 9
6 5 9 1
7 8
4 3
2 3 9 4
8 9 1 5
5
7 6 1 9 2
2 7 6
Hard #4
3
6 8 7
7 4 5 6
8 3 4 5 6 2
5 3
7 3 4
8 1 3 9 7
4 3 8 1
6
Hard #5
2 6
6 2 8 7
3 2 4
8 5 2 9 7
4
1 6 7 8 3
8 1 9 7 3
3
9 4 1
Hard #6
8 6 9 4
7 5 3 9
2 3
1 9 7
1 5 2 4
7 6 2
1 6
4 2 3
3 1 4 6
Hard #7
8 7 4 1
7 6
1 4 3 9
6 8 3 9
3 5 1 8
4 8
2 1
2 1
1 3 4 2 5
Hard #8
9 2
7 3 6
1 4 6
3 6 1 9 5
9 4 3
2 8 6
3 1
4 1 5 7 8
5 9 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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