Printable Hard Sudoku

Set 1mal7hu. 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 9
1 6
3 9 2 8 7
3 4 6
4 8 1 5
7 5 4
4 2 6 9 7 5 1
2
7 3
Hard #2
8 5 9 7
3 2 4
9 3
5 9
3 8 1 7 4 2 5
5 8
6 2 7 5
5 6 7
1 4
Hard #3
3 7 6
8 9 4
8 7 4 1
1 5 7
9 5 3
3 2 8 9
4 2 7 5
9
5 1 4 8
Hard #4
2 8 3 5
9 2 8
3 6 2
2 8
6 4 5
9 3 7 5
7 1 5
1 3 4 2 9
5 1
Hard #5
7 1 8 5
1 4 2
5 2 6 9
9 4
6 1 7 3
4 3 2 7
3 8 5
1 9
4 8 7
Hard #6
6 2 9 7
3 9 8
5 2 6
4 3 8
9 7 5 8
5 4 9 3
1 7 9 4
8 3
2 7
Hard #7
7 6 9 1
2 3 7 8
3 5 7
2
1 3 2 6 4
6 8
5 4 1
9 3 5
5 4 7 2
Hard #8
5 1
3
4 6 1 8 9 3
6 1 3 8
3 1
4 5 7
2 9 7 6 4 5
4 6 1
5 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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