Printable Hard Sudoku

Set 1waoa83. 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 1 3 7
7 6 8 5
9 2
1 5 4
6 3 9 2
1 5 4 6 8
2 9
3 5
9 2 8
Hard #2
1 3
7 6 2
3 1 8 6
6 5 3 1
1 2
5 9 2 8 6 7
8 4 9
6 7 9 2
6
Hard #3
2 4 8 5
3 4 2 1
7 1 2
2 8 7
8 1 3 4 2
9 4
2 7
1 9 6 3
5 6
Hard #4
8 7 2 4 9
5 3
8 5
3 5 9 4
4 3
8 3 7
9 4 1 8
1 6 8
8 5 2 6
Hard #5
4 9 6
3 5 8
7 9 2 1
6 4 1 8 9
5 4
8 3
1 7 2 3 4
5 4
2 1 8
Hard #6
2 9 6
7 1 5
8 1 6 4
6 1 4
7 3 5 2 9
5 1
7 9 4 3 6
9 8 5
2
Hard #7
9 8 6 3 1
9 2 7
7 5 3
5 9 6
1 7 5 8
4 9 7
3 7
3 8
1 2 9 6
Hard #8
3 2 9 1
7 6 3 5
9 5 7 3
1 4 7
5 2
5 9 8
9 6 7 8
8 5 6
1 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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