Printable Hard Sudoku

Set 1nc1ei3. 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
6 7 9 3
7
3 5 9 8 2
9 2 3 7 6
6 9
5 4 1 8
7 4
1 3 2 5
4 8
Hard #2
3 2 9
6 4
8 4 5 6 1
1 3
7
5 4 1 2
3 4
1 9 2 5 3 6
7 8 3 9
Hard #3
8 2
4 6 2 5
2 6 7 4
8 5 6 1 3 2
7 3 8
6 8 5
4 7
1 5
7 2 3
Hard #4
8 6 4 3
4 5 1 6
2
7 5 9 2
1 4 7
6 3 4
6 8 9 4
7 3 1 8
1 5
Hard #5
7 9 1 3
6 5 2 1
5 8
3 8 7 6
3 4 9
4 2 1
4 1 2
5 7
9 6 1 4
Hard #6
8 5 4 1
7 1 3
7 2
8 9 6 7
9 8 4 3
6 4 5
5 3 8
6 4 7 9
3 4
Hard #7
9 4 2
3 5
7 6 3 1
4 2 1 8 5
2 9
6 8 2 3
4 7
2 6
3 6 5 4 8
Hard #8
9 8
4 2 7 1 3
3 5 4 2
2 8 4 3 5
9 1 5 3
7
7 2 5
3 4
3 7 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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