Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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