Printable Hard Sudoku

Set 16zv4u0. 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 4 5
7 6
6 8
1 5 3
9 8
2 3 7 5
9 1 5 2
3 9 1
6 7 5 3 4 9
Hard #2
1 8 6 3 4 2
8 4 9 6
1 5 9
5 2 1 3 9 4
3 5
9
4 5
6 9
3 5 2
Hard #3
2
6 1 7 8 5
5 1 9 8
1 8 2
4 9 6 8
5 2 9
4 3 9 6
1 7 6 4
7
Hard #4
2 3 1
6
4 5 1 2
8 7 4 9 2 3
4 5
5 6 4 7
5 1
9 1 3 8 5 4
2
Hard #5
8 9 4
2 6 1 7
5 3
1 6 4 8
2 3 1
9 4 2 6
3 1 7
9 8 2
7 6 3
Hard #6
1 2 5 8 4
7 8 3
9 1
2 3
8 7 2
6 3 5 4
4 7 1
6 1 8 9 7
6 7
Hard #7
9 8 4 3 2
2 5
3 9 4
4 5 9
3 9 6 7
8 6 4
9 2 5
4 3 6 1
6 9
Hard #8
9 8
2 6 9 3
2
3 1 6 2 8
1 6 5 3 2
2 6
7 2 3 9 8
6 3
6 4 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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