Printable Hard Sudoku

Set 116m6o2. 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
1 6 9 2
3 5 8
4 9 1 2 7
1
2 5 6 9
9 3 2
9 3 4
9 7 2 1
6 5
Hard #2
5 4 1
9 6 5 7
3 5 8 4
4 7 3 9
4 9 1
3
3 1 4 2
5 7 4
7 2 6
Hard #3
3 7 1 9
6 8 1
9 3 5 4
2 9 1
8 1 4 7
5 2 3
4 5
2 6
8 6 9 5
Hard #4
7 5 3 1 6
1 5 2 9
6
3 8
7 9 4 1
4 5 9
5 2
4 7 6 8
7 4 1 5
Hard #5
3 5 8 7 1
1 3 2
8 2 5 3
5 1 6
9 3 4 8
6 9 8 7 5
1 7
9 6 1
Hard #6
5 6 1 2
2 7 9 8 6
8 5 2
1 8
9 4
5 1 9
7 9
8 1 9 5 3 7
4 8
Hard #7
7 5 2
3 5 4 7
9 6 3 5 8
9 6
2 1 8
4 6 2 7
5 4 9
6 8
8 5 2
Hard #8
7 5 3
8 7
6 2 8
1 2
4 8 1 6
2 7 6 5
3 1 4
6 4 1 9 2
7 1 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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