Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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