Printable Hard Sudoku

Set 10l4a1a. 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 2
4 7 3 9
4 8 5
2 4 7 5 1
3 8
2 4
5 8
2 9 6 5
7 5 2 9 3
Hard #2
3 7
9 2 6 7 4 1
1
6 9 2 8
3 1 8 5
7 9
3 5 6
6 4 3 8
2 6 3
Hard #3
7 2 4
4 6 2 5
9 8
9 1
9 4 5
1 3 5 2 7
7 6 1 4
1 2 9 4
3 1
Hard #4
5 8
7 3 1
3 1 6 7
2 5 6 4
4 8 7 6
9 2
2
6 4 2 3 7 1
2 1 3
Hard #5
8 1 4 5
8 7
7 6 5 4 1
8 3 7
7 9 4
8 5 6
7 9
9 2 1 7
1 4 2
Hard #6
7 1 6
4 3
6 2 8 3
6 8 3 9
8 2 4
3 5 7 1
4 7
6 1 5 2
2 7 1
Hard #7
9 6 2 7
9 1
5 3 8
2 5 7 3 1
7
2 9 8
4 2 5 1
6 1 2 5
1 3 7
Hard #8
6 9 7
4 5 6
1 3 6 9
3 8 6
4 2 8
5 4
7 3 4
2 4 5 7 1 3
6 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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