Printable Hard Sudoku

Set xkju1o. 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 5 7 8
7 8 9 2
3 8 2
6 3
4 6 5
8 5 3 4 1
7 9 1
7 9
2 4 3
Hard #2
7 4
1 8
8 4 5 1
9 4 8 2
3 2 1 4 9
1 6
9 1 5
9 3 2 6
2 7 9
Hard #3
9 5 4 2
3 7 4 1
1 9 7
6 8 3 2
5 9 7 4
4 3 2 9
2 7
5 1
7 9
Hard #4
7 9 6 2
3
4 8 7
9 2 4 1
4 9 2
1 3 8 9
5 6 3 7 4
5
8 6 5 7
Hard #5
1 7
1 7 5
5 9 3
8 2 9 3
6 5 2 4
3 5 4 6 1
2 9 3
7 3 5
2 6
Hard #6
6
7 3 4 2
2 6 3
8 5 9
2 3 8 7 1
7 2
1 5 6
8 7 9 2
9 4 5 3
Hard #7
3 5 2 7 8
7 9
2 8 1
8 2 7 5
7 9 4 6
4 3
4 7 5 8 1
9
4 6 8
Hard #8
6 8 9 5
3 9 8 7
2 8 7
4 9 1
8 7 4 6
2 1
3 7 8 1
6 3
5 6 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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