Printable Hard Sudoku

Set fy8o03. 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
1 5 7
7 4 8
1 4
1 2 6 5
2 3 7
8 1 3
9 4 7 1 6
2 4 5
2 8 3
Hard #2
3 4 5 1
9 1 6 4 3
8
8 7 6 4
5 4 8
3 9
6 9 2
9 5 4
8 7 6 2
Hard #3
8 5 6
7 9
5 3 6 1
1 2 3
3 5 9 4
6 8
1 6 9 3
9 4 2
4 2 8 5
Hard #4
4 1 3 7 5
5 3 6 9 1
5 4
6 7 9
1 7
4 8
3 6
4 9 3
7 4 6 2 5
Hard #5
6 4 2
5 1
4
2 7 4
4 6 8
3 7 4 5
5 2 7 9
8 2 4 5
1 3 6 2 9
Hard #6
1 9 7 2
2 7 8
8 7 6
3 1 2 7 5
6 2 8
7 3
3 2
5 2 9 4
1 3 6
Hard #7
5
6 1 7 9 5
9 3 6 2
1 4 9 2
2 7 3 1
8 7
5 1 7
2 8 6 1
3 9
Hard #8
5 7
9 2 3 1
3 8 4 9
8 3 9 1
5 1 4 8 6 7
6
7 3 2 6
2 4 6 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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