Printable Hard Sudoku

Set 188sgtb. 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 5
9 7 3
8 1 3 7
8
1 7 8 2 4 5
6 5 3 4
2 1 7
4 5
2 5 9 4
Hard #2
8 7 6 1
9 1 6
1 2 5
9 3
3 4
5 2 6 3 9
2 8 9
4 9 7 5
3 7 1
Hard #3
7 6
3 8 6 9
9 6 1 3
2 3 9
4 7 2
6 3 7 8
6 5 3
7 8 3 5
6 4
Hard #4
1 6 9 4 7
7 9 5
7
2 1 3
8 7 5
5 7 9 4
3 5
2 1 4 8
5 6 1 4
Hard #5
9 6 7 3
2 1 7
3 9 1 8
1 9 6
4 9 1 5
6 8 1 4
6 2
6 7
2 3 5
Hard #6
4 5 2
8 1 2 3
3 6 1 5
6 4 7 9 3
3 8 9
3
9 5
7 8 2 9
4 7 6
Hard #7
8 1
6 7 3 4
6
6 8 4 5
3 2 1
4 7 9 3
6 7
1 4 2 8
5 8 4 9 1
Hard #8
3 4 6
7 3 2
8 9 3 1
2 7 3 6
6 9 1 4
4 9 8 5
5 8 9
7 1
6 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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