Printable Hard Sudoku

Set 1tzht9t. 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
4 6 8 9
3 2 4
1 4 5
1 8 5 6
7 8
9 2 5 1
8
2 6 1 8
3 1 6 8
Hard #2
8 6 2
1 3
1 5 8 7
7 4
1 5 3
5 4 6 1
4 2 5
8 7 6 5 2
6 5 2
Hard #3
8 5 4 9
6 8
4 8 2 5 3
6
7 8 2 1
9 6 3
5 9
4 7 2 9 5
1 7 4
Hard #4
6 3 1 8
3 9 5 7
2 9
9 5 4 7 3
1 2
7 4 8 1 5
6 4 9
1
4 2 1
Hard #5
5 4 7
4 2 1 3
9 8 4
2 4 7
5 3 6
8 9 1
9 1 5
6 2 9 3
7 6 2
Hard #6
2 5 9 8 4
2 3 8
9 4 2
6 2 8
6 1 2 3
3 7 9
5
1 2 7 4 5
3 7
Hard #7
5 3 2
9 5 3 7
7 6 5
1 6 4 5
5 1 8 2
3 9 1
7 4
1 5 9
4 5 2
Hard #8
6 3
4 2 9 6 8
4 7 1 5
4 6 8 5
1 9
9 3 2
2 3 8 7 1
9 1 3
5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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