Printable Hard Sudoku

Set 33akuc. 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
9 3 1
8 6 5
9 3 8 2
7 5 9 8
1 7 4
6 5
2 5 6
4 1 9 8 3 2
Hard #2
8 4 1 9
2 8
4 3 1 5
5 6 9
6 2 3
7 1 9 5 8
8 1 7
7 3 5
2 8
Hard #3
5 4
1 6
9 7 1
8 4 5 9
3 8 4
9 5 2 3 1
3 1 7
2 7 4 9 5
2 4
Hard #4
4 2
5 3 6
3 2 7 5 8
5 7 2 9 4 1
1 9 4 8
4 9
3 4 9
9 6 1
2
Hard #5
7 5 4 2 6
1 8 2
9 5
7 6 8 3
3 6 7 4 1 2
9
2 3 4
4 1 8
9 6
Hard #6
7 6 3 5 2
4
3 7 8 4
2 4 7
1 6 2 8
3 4
2 3 9
8 2 7 5 1
5 7
Hard #7
5 8
2 7 8
1 8 7 3 4
1 9 2 4 6
5 9 3
4 3 2 5
2 8
9 5 2 1 6
Hard #8
3 1 9 2 6
3 1 7
6 8
5 2 7 6
3 7
8 9 5
2 1 6 4 5
7 8 3
8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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