Printable Hard Sudoku

Set ia76h9. 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 4 6
8 1
5 1 2 6
4 1 9 5
3 9 8
2 5 1
8 5 3 1
6 7 8
5 3 2
Hard #2
2 9 3
3 9 5 7
8
9 7 2
4 1 9 5
9 2 5 6 8
5 3
5 4 6 8 3
6 3
Hard #3
3 6 8 9
1 6 8 2
2 8 5 4 3
2 6
3 2 9
4 8 1 2
5 7 1
7 9 8
4
Hard #4
1 9 3
2 3 4
3 1 6
6 8 9 4
2
1 6 2 8 9
4 2 1 3 8
7 4
6 8 5
Hard #5
1 7 5 3
3 5 9
4 2 1
5 8 1 6
7
1 3
8 3 5 7
3 9 8 2
9 7 1 3
Hard #6
6 2 5 3
9 1 6 5 4
8 7 1
7 8 6
1 5
2
9 5
3 5 9 6 2
2 4 3 8
Hard #7
8 2 3
6 9 7
4 5 9 8 7
1 4
5 6 7 2
4 8
1 8 4
7 5 4 9
2 6 8
Hard #8
6 8
1 5 2 7
3 5 1 9
1 4 2
7 5
7 2 3
3 6 5
2 9 3
7 1 6 9 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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