Printable Hard Sudoku

Set y63xhr. 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 2 6
6 2 1 3 8
1 7 2 5
5 7
1 5 4
4 7 9 6
8 1 4 2
4
7 9 8
Hard #2
5 3 6 9 1 7
3 9 4 7 5
7 2
4 8 1
2 1
6 3 4 9
5 6 3
7
8 9 2
Hard #3
7 6 4
9 8
6 4 5 7 2
5 3 4 2
3
9 3 5 1 4 8
2 9
4 2 7 6
1 8
Hard #4
5 9 1
9 5 8 6 2
2 4
4
9 3 5
7 1 8 5 3
3 6 2
5 4 7 2 3
7 9
Hard #5
6 9
8 5 4 3
9 1
5 8
7 2 1 3
4 3 5
8 6 9 5 7
2 1 3 5
1 7 6
Hard #6
2 6 9
8 2
5 3 1
6 4 3 7
9 1 5
5 8 4
2 5 3
7 8 2 5 3 4
9 1
Hard #7
4 8 7 5
5
3 6 7
3 2 7
6 4 1 2
4 5 9 7 6 3
2 5
8 4 3 1
1 8
Hard #8
2 5 6
1 9
9 4 6 1
3
7 3 6 2
8 7
2 9
3 8 7 4 2 6
2 1 7 8 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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