Printable Hard Sudoku

Set 1p2f7uj. 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
2 7 4
5 8 3 2
5 9
4 2 9
2 9 4 6
1 7
8 6 1 2 5
1 7 8
2 6 4
Hard #2
1 3 6 5
5 8 6
4 9 3 1
2 7 9 1
9 7
6 8 3
5 3
6 2 7 4
4 8 7
Hard #3
1 5
8 7 3
3 8 4 6
4 6 9 3
6 2 4 8
9 7
8 2 4 7 3 6
7 2 1
8
Hard #4
3 8 7 5
2 9 5 3
5 1 2 6
7 5
4 8 6 1
1 5
3 6
4 2 1 8
9 5 2
Hard #5
2 5 4 7 1
1 9 3
6 1 2
4 1 8
2 8
6 4 5 2
7 9 4
2 4 5 7
8 1
Hard #6
7 8 3 1
1 2
6 3 9
2 1
7 9 5 8
7 9 1 6
5 1 6
3 6 2 7 8
9 5
Hard #7
5 6 8 7
3 9 4 6 8
6 1 2
9 1
5 8 4
4 6 1 3
4 7
6 7 1
3 8 4
Hard #8
1 2 4
2 8 7
8 9 7 5 3
4 1 8
2 7 3
5 8 4
7 8 6
6 4 5 1
3 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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