Printable Hard Sudoku

Set o9abt2. 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
9 1 7 8 4
2 3 5 1
1 6 5 2
1 7
2 3 4
6 5 9 8
6 8 4
8 5
5 3
Hard #2
6 2
2 9 4
1 4 8 3
9 7 5
4 7 2 6 9
3 9 6
3 7 1 6
5 4 3 1 8
Hard #3
2 5
5 8 3 7 9
3 2 6
3 8 4
5 8
9 1 6
8 6 5 9 1
2 9 7 8 1 4
Hard #4
8 6 5 4
7 6
5 4 9
3 7 4 5 8
7 9 3
2
7 6 1 2 9
4 3 6 5 7
5
Hard #5
5 1 3
7 9 5
1 4 8 6
8 2
9 3 2 8
3 6
4 2 6 8
1 7 5 4
7 8 5
Hard #6
8 6 7 1 2
7 1 6
9 5 8
1 9 5 3 7
8
2 5 3
2 6 5 9
9 4 2
5 1
Hard #7
1 6
2 5 6 3
5 1
9 5 4
9 3 4 5
8 5 2 3
7 6 3
8 5 9
1 2 7 6
Hard #8
8 7 3 2
5 1 3
6 2
2 1
8 5 4
1 5 9 7 6
3 2 8
2 4 9 5 8
5 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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