Printable Hard Sudoku

Set 2v24yp. 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 5 3
3 6 8 1
1 2
7 9 5 8 2
3 8 9
1 4 6 3
1 5 2
6 5 2 9 4
Hard #2
9 6
1 8 4 3
3 7 5 8 4
7 8 6 9
5 3 7
4 6 3 1
8 7 6
5 8
2 1
Hard #3
2 7 8
3 9 1 8 5
5 1 6
7 9 1
4 2 8
8 5 4
3 2
9 8 7
4 5 2 1
Hard #4
8 3
6 8 4 7 1
5 9
8 5 1 9
3 2 4
1 6 9 4 2
5 2 7
1 9
3 9 8
Hard #5
3 5 6
3 8 2 7
8 6 4
3 6 5
2 5 6 8
7 6
4 2
7 6 4 1
6 1 7 2
Hard #6
8 4 6 5 1
7 2
1 9 4 7
7 1 5
2 5 9
8 2
9 8 5 1 6
2 4 8 3
9
Hard #7
3 2 4
6 1 5
9 6 3 1
3 2 1
9 8 7 6
7 3 8
2 7 4 3 6
6
6 1 5
Hard #8
8 2
7 1 8
4 5 7 2
5 8 1
1 3 5 9
9 8 6 3
8 6 9 1
3 5 9
3 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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