Printable Hard Sudoku

Set r4xjki. 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
8 6 4 5
2 7
5 1 6 9
8 5 3 6
1 2 4
9 5 8
2 1
9 5 2
5 8 4 6
Hard #2
8 2 1
5 3 7 6
6 1 8 9
3 9 5 4
7 1 8
5
1 2
2 1 7 3 4
3 1 6
Hard #3
4 7 1
4 6 3
6 8 4
2 4 3
7 3 9 6 4 2
2 8
1 8
4 9
6 9 3 4 5
Hard #4
2 9
8 7 4
4 3 1 9 6
1 4 7 3
7 1
2 3 1
9 7
7 6 2 8
5 9 1 4
Hard #5
3 7 5 8
6 8 9
7
7 4 1
9 4 5 2
1 5 6 4 9
5 2 6 3
7
5 6 3 4
Hard #6
1 9
8 5 1
2 9 8 1 3
6
4 7 5
8 2 1 3 7 9
1 4 7 8 3
3 7
6 4
Hard #7
4 8 5 2 6
2 9 8
1 5
8 4 2
5 6 8
1 3 6
6 7 2
7 5 2
8 3 9 7
Hard #8
6 7 9 5
2 8
5 6 2 8 3
8 1 5 3 4
9 2 8
4 1
9 1 6 5
5 9 7
7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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