Printable Hard Sudoku

Set 1bc8okp. 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
3 7 9 8 1
1
3 2 5
5 4 6 7
1 8 5 3
7 4 1 5 6
8 9
2 6 1 3
4
Hard #2
2 8 7
4
1 7 4 9 8
4 6 5
8 3 4
9 3 7
6 5 4 9 8
7 9 3
6 7 5
Hard #3
1 8 6 9
4 2 5 1
2 4
3 4 1 9
2 7 6
9 5 7
3 8
8 3 9 7 1
7 5
Hard #4
8 1 6 7 5
2 1 8
4
6 4 5
5 9 1
8 5 2 6
3 4
5 7 6
7 6 3 1 2
Hard #5
7 3 9 4
8 7 6
1 5 8 7
1 6 3
9 1 7
4 5 8 2
3 1 9 4 5
2 4 8
Hard #6
5 3 4 2 9
4 7 1
2 9 1 6
4
8 7
6 8 2 5
2 1 7 5 6
9 7
5 1 6
Hard #7
2 4 1
7 9 6
8 9 2 3
4 6 3
5 1
7 4 8
9 1 6 7
3 7 4 9
8 9 5
Hard #8
2 4 5 7
1 2
9 1 8
3 2 6
7 8 3 6
5 2 1 4
3 2
5 4 3 7
7 4 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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