Printable Hard Sudoku

Set 1d57n4l. 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
9 5 4 7 6
6 9
7 4
8 9
5 6 7 2
4 9 2 8 1 6
6 2 7
4 8
7 3 1
Hard #2
6 9 8
3 2 4
3 8 4
2 1 6 3 4 9
4 2 8
3 1
1 7 3 5
5 4
8 4 7
Hard #3
6 1 7
9 6
2 1 5 9 3 4
4 2 9 1
8 4 3 2 9
7
1 5 8
2 7 6 9
8
Hard #4
1 9 2 4
5 6
6 7 3
2 3 8
4 3
3 1 7 4
4 5 1
5 9 6
3 2 6 8 5
Hard #5
8 6 9
1 9 8 7 3
3 2 4
3 4 2
5 9 6 3 8 4
8 9
5 7
9 1 2
2 6
Hard #6
2 9 3
8 2 4
5 8 9 7
4 6 5 8
5 7 2
4
7 3 5 2
6 8
6 4 9 7 8
Hard #7
2 4 9
3 4 1
4 8 1 3
3 7 4
5 9 4 2
6 5 3
8 2 4 5
2 8 1
7 6
Hard #8
2 4 7
3 1 8 4 2 5
9 7 4 1
3 2
8 4 6
5 9 1 2
8 4 3
9 8
1 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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