Printable Hard Sudoku

Set ogahy2. 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 6
7 8 5
3 9 5 4 7
4 7 5
3 8 2
4 8
7 5
1 5 2 8 9
8 5 4
Hard #2
5 4 2 1
8 3 6 5
8 3
8 2
9 6 8 4
4 2 3 6
1 7 2 4 3
6
2 7 3
Hard #3
4 1 9 3
4 6
8 2 7 9
3
3 1 7 2 8
6 3 1
7 6 2
1 5 9 8
7 2 6
Hard #4
8 3 2 5
9 4 3 7 1 6
4 9 2
2 3 8
5 3 7 6 9
8
2 1 6
6 2 5
8
Hard #5
7 3 1
2 8 6 4 3
5 9 3
8 6
6
6 3 8 7
6 5 1 7 3
7 9 4
9 2 7
Hard #6
6 4
9 2 4 7
4 3 1
3 5
3 1 5 2 4
8 4 6 7 1
9 3
4 9 1 2
8 5
Hard #7
9 6 1 3
7 1 2 9
6 9 7
1 4
5 3 2 6
3 7 9 5
4 2 8 3
6
3 4 7
Hard #8
4 9 6
3 5 7 8
5
3 2 4
5 7 1 8
1 2
7 3 5 2
4 6
2 5 3 4 9 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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