Printable Hard Sudoku

Set 1sfldx8. 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
7 1 9
3 6 4
1 6 4
5
6 8 2
9 2 3
1 6 7 9
4 3 2 5 6
8 7 6 4
Hard #2
8 4 9
8 3 4
6 1 2 7
2
8 3 7 5
9 6 4 5
5 4 9 1 6
7 3 5 9
7
Hard #3
9 2 1 5 6
7 1
2 1 8 7
4 8 6 5
6 5 2
2 4 1
2 7 6 4
2 3
9 2
Hard #4
7
6
2 1 3 6
1 5 8
4 2
6 9 4 3 8
8 4 1 9 2
7 8 9 4
9 3 1 5
Hard #5
5 1 4
7 4 5 2
8 9 2 6
3 7 2 5
8 3 4
6 5 1
1 4 8
2 9
7 2 9
Hard #6
3 9 4
7 5 1 6
1 8 4 3 6 2 9
5 2 7
2 9 5
4
5 4 7
6 8
2 8 1
Hard #7
7 4 6 5
1 3
3 4 2
2 8 6 9
9 8 5
5 7 1 8 2
8 2 1 7 5
5
1 9
Hard #8
7 1
3 9 1 7
1 4 5 6
5 9 1
6 9 4
1 2 3
6 8
3 5 8 7
3 5 8 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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