Printable Hard Sudoku

Set 1f1nzb3. 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 7 2
1 8 2 6
7 5 9 1
1 5 9
5 3 1 6
2
4 9 3 1
9 5 1 8
2 5
Hard #2
3 9 8
7 6 2 1 3
2 6 7
6 8
7 6 3 5
8 4 7 1
8 1 6 2
3 1
5 3
Hard #3
2 8
7 9
9 2 8 1
5 4 7
2 1
2 6 9 5 8
2 4 9 3 7
8
1 8 6 5 2
Hard #4
9 2
9 7
1 7 5
2 3 7
3 9 8
9 1 7 4 2 6 3
5 4
6 9 1 8
3 5 4
Hard #5
3 6 2 7
2 7 1 8 6
7 4 9
9 8 1
5 2 1 4
3 2 5
6 9 4
3 7
4 5
Hard #6
1 8 2 6
7 3 5 1
3 6 7 8
3 8 5
7 5
6 4
4 2 9
5 6
1 8 3 4 7
Hard #7
1
5 1 4 6
2 7 8
8 7
9 2 8 4 6
1 3
5 2 1
5 1 8 4
4 7 2 5 3
Hard #8
2 1
8 9 3
3 7 1 5
3 7 4
2 1
8 4 9 6
5 3 7 1
3 1 2
7 9 8 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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