Printable Hard Sudoku

Set 1ay4sot. 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
5
5 3 9 2 8
9 7 3 6
6 7 3 5
1 5 9 6
8 6
2 7 1
5 8 3
4 8 9
Hard #2
1 3 6 5
2 9 1 4
8 1
6 5 2 7
9 1 5 7 4 3
8
4 6 2 1
4
6 2 7
Hard #3
7 8
2 9 8 1
3 5 1
9 7 2 5 3
3 4 7
4 8 3 5 7 2
2 4
5
7 6 9
Hard #4
2 1 4 8
7 3
3 8 2
3 6
4 5 2 9 1
7 5 8
6 3 1 8
4 6 8 1
5 9
Hard #5
6 8 4 3
3 4
1 8 4 6
6 8 3
7 4 2
5 9 8 1
7 2 9
9 2 4
1 9 7
Hard #6
8 6
4
3 7 1 5
2 9 3 7 8
1 2
2 6 1
4 5 2 6 7
6 7 4 5
7 1 5
Hard #7
8 9
5 7 8 6
3 5 8 1
1 3 4 7
6 3 9
5
5 3 4 6
1 2 6
2 1 3 8
Hard #8
2 8 9
1 4 5 7 2 8 3
4 6
5 4 3
6 9 7 5
9 8 3 1
3
8 5 2
4 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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