Printable Hard Sudoku

Set 3o47rh. 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
3 1
1 8 2 5
6 4 3
4 9 6 8
5 2 4 1
8 2 3
7 8
6 7 2
6 3 2 9
Hard #2
3 6 4
5 4
3 8 7 1
7 5 1 3 2
4 8 2 9
2 7
8 4 7 9 5
4
6 2 9
Hard #3
9 8 2
4 9 6
7
4 5 8 1
3 2 9 4 7
2 4 8 6
3 7 8
4 2 6
9 8 6
Hard #4
4 2
7 2 4 3 9 8
5 1
2 9 1 6 5
6 2 3
8 5 4
3 1 6 9
2 3 8
7
Hard #5
1
1 8 4
7 2 6 1 9 3
8 4 9
7 6 4
2 3 1 7
6 7 5 8
7 3
8 3 9
Hard #6
7 1 9 5
6 8
2 4
4 8 9
9 1
6 9 8 7 3 4
4 7 8
2 6 4 7
6 7 3
Hard #7
6 3
4 9 1 8
7 2 3 1 5
5 9
5 7 2 3
1 6 9 4
3 8 5
1 6 7 8
2
Hard #8
3 8 4
9 8 7 5
6 7 2
3 5 8 1 9 2
7 1 8
9 2
7 2
4 8 3 5
6 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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