Printable Hard Sudoku

Set 1sywcp2. 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 7 2 6
3 4 5
9 3 2
5 6 8
4 3 9
2 5 6 1
2 9 7
6 7 1 9
5 4
Hard #2
9 2
3 4 8 5
8 2 4 6 1
1 3 2
9 1 4
6 7 5
8 5 3
9 5 1
4 3 8
Hard #3
7 5 4
9 8 1 3 5
5 8
1 7 2 3
4 2 3
5
3 1 8 4
8 1 2 6
2 6 9
Hard #4
9 3 6 5
2 9 4
4 5
8 7 5 2
7 5 8 2 4 1
9 1 7
4 6
8 7 3 2
9
Hard #5
5 8 2 1
3 9 1 6
4 6 7
8 3
6 4 8
4 2 6 9
2 8 7
5 9
7 9 8 1
Hard #6
8 6 7
3 2 5
7 1 6
1 7 4
6 3 4
9 2 6 8
9 7 3 5
8 7 2
4 3 9
Hard #7
7 4 1 2
9 3 2 1 8
8 1 4 5
4 1 2 5
3
5 1 3
6 7 5 4
2 8
4 3
Hard #8
1 3 6 5 2
2 8 6 4
8 5
5 1
7 9 3
9 1 5 2 4 7
2 1
7 4 8
6 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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