Printable Hard Sudoku

Set 1p22tas. 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
8 3
4 1 2 3 5
3 6 9 1
5 2 7 3
1 6
8 6 4 2
8
2 1 6
6 7 3 9
Hard #2
2 4 5 7
4 2
9 7 8 6
4 6 2 8
1 5 8
3 5 4 6
7 3 6
5 2
9 3 7
Hard #3
3 1 8 4
5 3 4
2 5 8
2 8
1 9 7
8 9 2 7
4 7 6 1 2
6 3
3 8 4
Hard #4
4 7
3 5 9
1 2 8 4
9 2 1 5 4
2 6 5 9
5 7 3
8 9
5 4 3
7 6 1
Hard #5
1 8 7 9
5 9 1 6
2 5 7
2 1 9 4 6
4
6 8 7
6 9 8 3
1
4 7 2 6
Hard #6
9 5 4 6 8
1 6 2 7
3 2 5 4
4 9 5 1
3 6
9
1 8 7
8 2
2 6 1 9
Hard #7
9 6 4
4 8
2 3 1
5 4 7 2 9
4 1 3 6
6 8
4 2
5 1 6
1 8 7 3 4
Hard #8
1 2
1 3 9
4 5 8 3
3 5
6 4 9
9 5 1 3
1 9 7
2 4 3 1
7 3 8 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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