Printable Hard Sudoku

Set oqx0ex. 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
1 5 7
1 5 7 8
6 3 9
8
1 9 3 4 2
4 8 3
5 2 7 1
2 5
3 4 1 6
Hard #2
9 5 4 6 8
2 1 7 5
7 5 1 2
4 8 6 9
3 7 5 4 2
1
9 8 3
9
4 8
Hard #3
9 6 1
6 1 4
7 4 3
8 5 9
6 5 8
2 8 9 6
4 3 2 5
1 8 4
8 3 6
Hard #4
7 1 8 9
6 1 9 8 7 5
4 5 3
9 5 8
8 7 5
7 2 4 9 3
9
2
8 3 1
Hard #5
4 2 9
4 8 5 9
9 7
7 6
7 8 1
2 3 1 4
2 9 4 6 5 3
7
3 2 4 5
Hard #6
2 3 1
3 7 4
8 9 6
9 4
7 2 1 9
1 8 6
1 2 5 4 9
3 8 5
5 7 1
Hard #7
1 9 4 2
5 8 1 9
8 7 3 4
5 3
9 2 7 5 6
3 8 2
9 8
6 2 8
6 9
Hard #8
5 3 2
3 4 8 9 5
6 4
9 1 4 2 3
7 5 1
4 2
8 3 5
9 7
2 4 1 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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