Printable Hard Sudoku

Set 18d797e. 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
5 7 6 4 1 3
1 8
8 9
5 9 7
9 3
4 8 5 1
1 8
6 7 4 3
9 8 5 6
Hard #2
3 2 6
7 9 1
1 9 6 4
5 3
2 3
7 8 6 5
4 1 5 9 7
9 1 3
8 2 1
Hard #3
9 4 6
3 6
7 8 1
2 7 3 5 9
8 1 5 4
2 6 3 1
4 9 1 6
5
6 8 7
Hard #4
9 2 4
4 1
9 5
7 3 6 9
8 1 7
9 7 3 4 8 1
5 4 7 3 6
8 5
3 1
Hard #5
2 9 5
4
4 8 1 9
7 1 6 8
6 8 3 2
9 7 2 1 3
1 3 2
1 5
8 6 4
Hard #6
7 9 1
8 6 1 7
6 5 4 8 9
1 7 4 9
1
6 8 9
2 4
5 3 7 2
7 6 5
Hard #7
4 1 8
8 2 3
9
2 5 7
3 7 6 9
9 3 2 8 1
5
9 5 3 4 6
3 4 1 8
Hard #8
4 8 7
7 3 2 9
6 8 5 3
5 2 4 9
4 7
9 3 6 8 7
1 7 2 6
7 9 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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