Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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