Printable Hard Sudoku

Set 1jx7pts. 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
2 8 7
4 6 5 3 2
3 1
2 6 3
7 1
7 9 4
5 4 8
5 2 1 8 7
6 4 5
Hard #2
8 2 7 9 5
7
6 4 7 5 8 2
5 7 9 6
1
6 4 5
4 6 5
5 2
2 1 7 3
Hard #3
3 6 7 8 2
1 6 9
8 2 7 5 3
6 2 8
2 4
7 2 9
9 4 8 6 5
5 3 7
Hard #4
5 2 3 4
6 4
3 4 5 7
2 3 7 6
2
9 6 1 2 8 3
4 8
8 5 2
6 8 9
Hard #5
9 5 4
2 1 4 6
3 6 8 5
5 2 4
8 9 1
4 8 2
2
4 7 5 3
1 6 9 5
Hard #6
6 7 1
2 8 9
6 8 7 2 4
9 7 3
6 2 1 5
9 3 6
2
3 9 5
6 5 4 8
Hard #7
1 4 3
1 4 5
4 7 5
1 4 8 6
5 2 3 4
2 8 9
9 8 1
6 8
1 3 7 9
Hard #8
1 6 3
5 1 8 3
2 6
9 3 8
4 8 5 1
8 3 9 2
7 2 6 1 5
8 7
4 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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