Printable Hard Sudoku

Set 19tevyv. 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
5 7 9
8 4 1 3 2
3 2 1
6
9 1 4 7 5 3
9 4 7
2 8
5 3 9
3 6 8
Hard #2
2 8
1 2 8 9 4
6 4 7
7 5
4 9 1
9 8 4 3
1 3 2 9
4 5
3 6 8 7
Hard #3
1 8 2
2 5 7 1
7 9 2
8 1 4 7 6
4
9 7 5 6
1 2 9
3 9 1 8
9 3
Hard #4
3 7
9 6 8
2 4 1 3 6
5 3 1 4
5 3
9 6 2
8 5
9 4 7
5 4 6 2 3
Hard #5
2 3 8 1
3 5
4 7
3 2 4
6
6 5 8 9
5 9 6 8
4 2 3 9
7 6 9 5 2
Hard #6
7 1 6 2 8
8 9 7
8 7 6
4 9 6 1
3 9
5 4 6
9 4
7 3 8
9 6 5 3
Hard #7
5 1 9
9 8 3 6
3 1 2 8
7 4 8
1 2 4
8 5 4 9
7 3 9 5
4 7
5 1
Hard #8
6 1 5
7 5 2
8 6 2
8 7 9
9 5 8 4 1
1 2
2 5
9 4 3 8 5 7
9 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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