Printable Hard Sudoku

Set 15g3g74. 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 3 4
4 2 8 6
7 5 3
9 2 4 3 8
3 1
8 6 2
9 8 1
2 1 8 6 7
Hard #2
3 4 5
3 6 1
9 5 7
7 3 8 6
1 2 7 5
6 1
5 7 4 2
9 7 5 4
9 2
Hard #3
5 1 6
4 3 2
3 6
1 7 6 8 2
6 8
8 2 5 1
1 5
9 5 7
8 2 4 3 9
Hard #4
8 7 4
4 8 5
6 3 1
4 8 1
9
1 6 3 7 4 8
6 3 2 5
2 8 1
9 5 7
Hard #5
6
2 8 5
9 4 3 8
8 7 1 2
3 9 4 7
4 2 1
3 7 8 4
1 6 7
5 3 6
Hard #6
5 3 4 8
4 8 2 3
6 5 8 9
2 9
7 2 1 8
6 5 1
4
7 5
9 5 7 1 6
Hard #7
7 5 3 6 8
4 7 2 1
6 3
1 4 8
5 3 9
9 3 2 4 1
4 2 5 8
9
4 8
Hard #8
2 8 7
1 9 3 5
3 6
1 2
4 9 6
8 3 6 4
5 4 9
7 6 4 5
7 4 1 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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