Printable Hard Sudoku

Set ulnbf2. 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 1
7 6 9 4 3
8 7
7 5 2 6
3 5
5 6
7 6 8 5 9
7 8 4
3 9 2
Hard #2
5 1 2 7 9
2 9 8
6 4 2
4 2
2 3 9
5 3 1
8 1 3 5 2 9 6
6 5
8
Hard #3
7 8 5
8 5 9 3
2 1 3
4 9 1 7
8 7 6
2 3 1
5 1 8
4 6
3 4 2 5
Hard #4
4 3 5
5 7 2 4 9
1 7
7 3
9 8 2
4 1
3 8 6 4 5
5 6 4
2 9 8 5
Hard #5
1 8
7 5 6 3
7 4 9 6
2 6
1 8 4 3
4 3 1 2 7 8
8 7
5 8 1
2 6
Hard #6
3 9 8
8 1 3 4 6
7 2
7 1 3 6
5 8
6 2 5
7 4 8 1 9
9 2
5 2 4
Hard #7
1 7
4 9 3
3 9 5
2 3 6
8
1 9 5 4 8 7 3
4 5 6
6 7 1 4 8
2 1
Hard #8
9 1 6
2 4
8 2 9 7
6 3 2
1 5 3 8
8 9 4
9 1 2 8
5 4
5 1 8 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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