Printable Hard Sudoku

Set f4t6ff. 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 8 2 9
6 8
7 9 1 6
5 6 8 4
1 3 6
8 3 4
9 5
5 2 7 8
2 7 3
Hard #2
3 1 2 7
9
4 2 5 7 6 8
1 2 7 4 9
8 3
7 9 8 6
4 3
1 7
2 6 1
Hard #3
3 4 7 5 1
2
4 7 9 2
2 9 8
7 8 1
6 5 7
4 3 8 7 9
8 2
4 6 8
Hard #4
1 8
6 9 8
2 3 4
3 1 2
8 7 2 1
7 5 8 9
8 1
9 4 5 7
1 6 4 8
Hard #5
9 4 1
2 5 3
1 6 2 7 9
6
6 2 7 3
7 4 1 2
8 1 6 3
2 6
2 8 3
Hard #6
4 9 6
3 8 1 9
5
4 2 6
2 3 5 7
1 6 7 3
7 5 1
5 6 3 1 7
2 5
Hard #7
7 8 3
3 6 5
9 4 7 2
6 2 8
8 1 7
1 5 7
6 3 9 1 8
1 7 5
2 6
Hard #8
9
6 4 5
7 2 3 5 9
7 8 6
6 7 4 2 5
8 6 9 3
8 4 1
3 7
5 8 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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