Printable Hard Sudoku

Set 1htf3a0. 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
8 1 2 5
4 6
1 9 8 6 3
8 3 7
5 1 8
7 3 5
7 4 2 8 6
5 2 1
Hard #2
5 9
1 7
6 3 4
2 9 7 1
7 2 4 9 6
9 1 5 6 8
4 3
1 5
2 8 6 4
Hard #3
8 2 1 9
3 2 1
5 6 2
8 6 1 9
2 3 9 8
7 1 6
1 8 5 4
5
7 3 8
Hard #4
9 8 2 1 6
6 7 5
3 2 8
3 7 1 2 4
1 3 6
6 7
9 8 4
2 6 9
4 7
Hard #5
8 4 2
2 4 8 9
9 1 6 8 5
3
8 9 7
4 1
6 2 1 9
3 9 1 2
8 1 4
Hard #6
8 7
7 2 8 3 5
2 4
3 6 1
4 7 1 5 3 2
8 5
5 6 1
1 4 2
2 3 7
Hard #7
6 9 3
7 9
6 2 5 7
4 8
6 4 7 8
8 5 4
3 8 5 1 6
4 1
1 3 2 9
Hard #8
4 3
2 3 7 1
1 9 6
9 7 5 2 4
6
5 4 3 1
3 8 1 5
3 8 9
4 7 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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