Printable Hard Sudoku

Set 1y3jnk4. 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
7 9 2
1 7
9 6 2 7 1
9 4 6
9 7 8 1
3 8 1 6
3 2 5 4
9
1 6 8
Hard #2
5 7 9
9 1 8 4
5 3
1 8 5 3
7 2 9
2 3
4 2 3 6 5
8 5
6 4 1 9
Hard #3
3 4
4
5 7 9 2
3 7 2 5
8 5 9 3
4 9 3 2
1 9 6
4 7
8 2 9 3 4
Hard #4
1 5
7 9 3 6 5
3 4 7 8 1 9
3 2
4 9 8 5
7
1 9
8 7 4 6
6 5 1
Hard #5
6 1 8 9 5
4 1 7 6
2
9 5 1
4 7
3 8 1
2 6 8
5 8 7 3
2 8 5 4
Hard #6
3
6 4 8 7
4 9 8 3
8 1 2 4 5
4 5 1
7 1 9
7 5 2 6
2 6 3
6 2
Hard #7
6 2 7 9
5 1 3
3 2 6 8 1
1 3 2 7
2 6
5 3 8
9 4 1
8 5
9 8 4
Hard #8
3 7 9 5
5 9 4 8
6 4 2 3
4 3 1
6 9 2 7
8
9 7 1 8 4 6
6 5
6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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