Printable Hard Sudoku

Set 1wm2e3d. 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
3 2 1 9
9 5 4 1
4 8 3
8
5 2 4
3 2 1 5 6
8 1
9 2 5
5 1 3 8
Hard #2
1 5 9
8 7 3 1
3 4 8 6
5 1 9
6 9 4 1
7 8 3 6
3 1 8 7
2
8 4
Hard #3
2 8 9
4 5 3 6
9 4 8
5 4 9
8
6 2 7
9 5 7
8 1 3 4 9
4 7 3 1
Hard #4
2 7
1 9 6
5 8 2 4
5 4 8 1
3 7 4 8
8 5 1
1 7 2
9 4 3
3 7 8
Hard #5
8 4 7 6 5
2 5 1 4
9 3 7
6 8 9
2 9 3
4 6 2
3 6 4 2
7
5 1 3
Hard #6
3 7 8
5 6
6 4 2 9
6 5 1
7 3 4
9 2 1 5 7 8
3 9 6
5 9
9 7 1
Hard #7
3 7 8
7 9 4 1
8 1 3 2 4
1 8
8 5 2 4
7 3 5
1 8
3 6 7
2 3 5
Hard #8
8 7 6
7 8 3
4 2 7
7 8 3 9
5 3 4
8 5 6
9 4 7 1
3 1 4
7 9 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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