Printable Hard Sudoku

Set riy77x. 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 8 7
1 7 8 5 6
6 1 2
1 5 9 3
2 6 1 3
6 7
3
3 6 9 4
8 4 1
Hard #2
9
6 3 8 1
2 5 1 7
6 3 1 8 5
9 7 6 4
8 5 7
2
1 6 4
8 9 7 3
Hard #3
5 6
7 4 9 3
8 9 3 1
6 9 3
2
8 3 2 6
4 9 7 2
5 7 6 4
8 4 5
Hard #4
9 2
6 2 1 9
4 9 6
4 3 5
1 5 9
8 2 7 3
5 2 9 4 7 3
3 4
4 1
Hard #5
7 8 4 1
2 5 7 3
9 6 8
7
8 9 2
5 8 3 7
7 1 8 2 4
8 2 5
3 6
Hard #6
8 1
3 5 8 9
2 7 9 1 6
6 2 5 3
4 3
8 7 1
5 1 2
2 5
3 9 5 2
Hard #7
2 1
5 3
6 3 1 8 4 7 5
3 7 8 5 1
9
6 3 4
5 4 1
1 2 3
3 4 7
Hard #8
4 5 1 3
9 3 2 7
5
4 3 8
7 2
2 6 1 7
4 1 5 7 9
9 4
7 8 4 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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