Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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