Printable Hard Sudoku

Set 1on2phz. 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
4 3 2
5 8
8 9 4 2
6 3 1
4 7 9 5 6
2 3 4
1 5
4 6 7 1
2 7 5
Hard #2
4 8 3 9
1 6
1 7 5 9 2
6 5 8 3
7 3 5
1 8 2
2 7
1 8
3 9 7 5
Hard #3
8 6
3 8 1 2
5 9 3 4
4 2 9
1 2 8
7 4 1
3 2 7
1 4
2 7 9 5 3
Hard #4
2
8 7 1 3 4
3 1 7
4 9 5 8
3 9
9 4 1
4 8 7 9
1 2 5
5 9 6 3
Hard #5
1 6 2 4
6 5 9 7
1 6
3 1
4
6 3 9 7
9 3 8 4
8 5 9 3
5 7 2 1
Hard #6
9
1 7 2 6
9 7 3 2
5 2
2 8 3
1 4
1 5 3 7 8
8 9 4 6
2 5 7 4
Hard #7
3 6 1 7
2 9
7 8 5 3 6
3 1
7 6 4 5
1 4
5 1 8 3
4 9 7
4 5 8
Hard #8
5 7 1 8
4 3
3 8 4 2 6
1
8 5 4
7 8 3 2
7 4 9
2 9 1 4 8
5 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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