Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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