Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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