Printable Hard Sudoku

Set isbb1p. 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 5 6 3 2 8
5 8 4 1
4
8 7 1 3
9 2 8
3 2 5
4 2
2 3 6
1 4 8
Hard #2
5 7 3
9 6 8
6 4 2 5
4 8 9 7 2
3 4 7
6 1 2 3
9
2 3 9 6
5 1
Hard #3
3 9
2 7 8 4
5 9 2
6 1
1 6 5
4 3 9
3 6 9 7
7 5 3
1 8 6 5 3
Hard #4
2 8 7
9 3 6 4
7 5 8
2 1 7 5
5 4 7 9
4 5 3
1 6 9
4 3 7
4 2
Hard #5
3
5 8 1 3 6
9 2 5
1 9 7
6 9 8 2
4 8
3
9 5 3 7 4 2
6 4 8 3
Hard #6
8 9 5
9 2 7
4 6 1 7
7 1 3 6 4
7 4 3
8 7
1 5 7 2
6 3 4 9 5
Hard #7
2 8 6
3 4 9
3 2 5
1 6 3 4
7 4 2
5
8 4 6 3 1
5 7 1
6 1 2 5
Hard #8
7 5 6
3 2 6
1 9 2 5
8 5 1
9 3
5 6
1 2 7 9 8
5 4 1
3 1 8 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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