Printable Hard Sudoku

Set u7gaaf. 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
6 2 7
1 8 5
4 5 2
2 3 9 6
5 1 4 7
2
1 2 9
2 9 6 4
5 8 7 2
Hard #2
4 2
2 8 3 9
5 6 3
2 3 6 9
5 4 9 8 1
8 7
1 2 7
9 4 5
1 9 5
Hard #3
1
4 5 6 9
9 3 4 7
7
6 9 3
5 7 3 9
2 1 9 3
4 2 5 8 9
1 8 6
Hard #4
7 8 5 3
5 7
8 6 2
3 6 1
2 4 8 5 6
5 3
1 9
9 2 1 3 6
8 7 4
Hard #5
6 4
7 1 2 6
3
1 3 9 8
8 4 7
4 7
3 1 4 6 7
7 5 3 8
2 7 6 9
Hard #6
3 6 2
4 5 8 6
1 8
3 5 1 9
6 2
2 7 5 4
6 8 4 9
7 1
7 9 5 8
Hard #7
2 3 6
8 7
9 8 1 2 3
4 8 9
8 7 1 4
9 3 2 7
3 2
7 1 5
8 9 6
Hard #8
8 9
6 3 4 5 2
9 1 5 4
2 4 6 3
7 2 3 6 1
6 5 7 4
1 8
9 7 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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