Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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