Printable Hard Sudoku

Set mio815. 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
9 7 5
3 2
2 3 1 7 9
9 4 2 3
5 6 9 8
3 7 4 1
5 8 9 3
8 5 2
Hard #2
4 9
1
3 4 2 1 5
2 8 7 6
6
7 5 4 9 3 2 1
2 9
9 6 4
1 6 9 8
Hard #3
6 1 3 7 8
2 7 8 9
4
5
6 5 3 9
1 4 8
9 5 3 6
1 8 7 3
8 1 7
Hard #4
9
8 3 1
7 6 4 5
1 2 6 9
1 2 7 5 3
3 8
9 4
2 5 8
5 3 8 2 1
Hard #5
6 3 7 8 5
9
8 9 5 6 3
1 6
2 7
9 7 2 8
9 4 3
3 1 9
6 5 1 2
Hard #6
9 6 4 2
3 8 4
1 3 8
8 9 2 1 4 5
6 1
4 7 9 5
4 2 1
8 9 6
8
Hard #7
9
6 1 7
4 7 3 1
5 6 3
7 2 8 4
6 3 9 7 5
1 4 8
4 1 2
6 2 4
Hard #8
8 6 1
4
7 3 4 6
4 5 8
9 8 1 6
5 7 4 1
3 5 1 2 7
1 2
2 4 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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