Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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