Printable Hard Sudoku

Set 1bx8a03. 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
3 8
8 6 7 5
4 7 8 9
9 5 8
5 1 6 9 7
3 8
4 5 7
9 3 1
6 5 4
Hard #2
8 1
5 4 6 2
2 9 4
7 9 5 8 1
8 4 6 9
2 8 4 7
1 3 2 4
3 8 9
Hard #3
5
3 7 8 2
9 7 6 3
8 3 4
5 9 1 3 2
2 3 6
1 5 9
2 5 7
6 2 4
Hard #4
7 1 4 5
6 1 9 3
5 2 3 8
9 5 8 1
3 8 6
9
2 4
8 9
3 4 2 7 8
Hard #5
7 8 5 1 4
4 6 9
3 6 1
8 1
5 7
6 2 3 5
5 6
7 4 8
7 6 9 3 1
Hard #6
2 1 6 4
6 3 4 9 2
1 3 7 5
3 8
8 7 9
1 7 5
3
8 1 9 6
7 2 4
Hard #7
9
5 1 2
1 9 8 7 5
9 3
6 2 8 1
8 4 1 7
2 7 9
9 3 2
7 9 5 4
Hard #8
5 2 7 3
4 2
7 4
4 5 9 1 8 7
8 5 3
6 9
3 1 5 7 8
3 8 6
3 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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