Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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