Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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