Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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