Printable Hard Sudoku

Set 1teq8t. 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 3 7 2
4 6
7 9 5 8
8 5 2
4 3 8 1
5 1 7 3
9 1 2 4
1 5
6 9
Hard #2
9 4
7 8 3 2 5
4 1 3
9 6 7
6 5 1 8
6 2
4 7
4 1 5
5 6 3 9 8
Hard #3
3 4
8 2
6 3
8 2 1 6
7 6 9 5 2 3
6 3 9
1 8 5
2 4
4 5 6 1 7
Hard #4
2 8 6 5
3 5 2
2 4 7
5 8 6 3
6 2 5 1
7
6 7 5
4 3 7
3 1 7 8
Hard #5
3 4 5 2 8 1
6 8
1 5 3
5
6 5 9 4
9 7 3 4
5 3 7 6
4 2 9
6 8
Hard #6
7 9 3 8
3 1 6 7
4 5
1 2
2 4 5
4 2 9 8
8 7 5 9 3 6
4 8
6 7
Hard #7
5 1 2
8 7
2 4 1 7 5
8 7
9 4 2 5 8
4 3 1
5 9 4 3
3 7 6
5 9
Hard #8
4 9 6 2
6 2 1 8
1
1 3 2 6
7 9 6 3
6 7 5
3 7
3 8 2
6 2 9 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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