Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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