Printable Hard Sudoku

Set 74kyef. 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 1 2 9 5
3 8 5 9 7
6 2
6 1
7 8
7 9 3
4 6 3 8 7 1
7 1
5 4
Hard #2
9 7
8 6 2
6 3
4 2 8 7
7 9 8
9 8 3 4
3 6 2 7 8
5 4 9
9 8 3
Hard #3
3 5
8 2 7
9 5 2
4 7 5 2
6 7 3
2 6 8
8 7 3 1 5 6
1
3 6 4 8
Hard #4
9 3 1
4 1 8
2 6
9
1 5 3
3 8 2 4 6
1 9 6 3
9 7 1 4 5
5 1 4
Hard #5
5 1 7 6
3
3 7 9 1 5
4 3
3 7 1
2 6 5 8
2 9
9 4 8 3
4 7 2 1
Hard #6
4 7 5 2 6
3 8 4
9 1 5
9 4
3 5 2 1 7
6 5 2
4 2 8
2 3 8 6
2
Hard #7
4 7 8
1 7 5 4
9 6
2 1
1 9 6 2
9 4 6 3 7
9 7
3 8
2 7 8 3 1
Hard #8
2 7 3 4
5
5 9 2 1 7
4 3 8 2 9
5 8 6 2 1
7 8 6
1 5 7
4 2
6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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