Printable Hard Sudoku

Set 1luhu1g. 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
6 9 4 2 7
5 8 7 9 2
2
4 6 9 3
5 6
1 2 4 9
8 1 9
5 1 8
1 7
Hard #2
4 7 5 6 2
5 9 4
1 9 7
2 5
7 3 6
3 8 2 4
6 1 7
8 9 4 6
6 8
Hard #3
5 1 2
6 9 8 2
5
2 5 3 6
1 5 7 4
8 3 5 9
6 4
9 1 4
7 2 4 1
Hard #4
9 5 7 4
8 5 1 7 9 3
7 2 4 3
4 1
6 4 5
1 7
9 4
2 6 4 9
5 9
Hard #5
3 4 2
9 7 4 8
2 1 8 7
1 2 9 6
8 7
7 4 3 2
5
2 1 3
8 4 9 6
Hard #6
6 3
4 9 8 5
7 5
4 9 2 5
5 1 8
1 5 4 9
3 2 1
2 1 9 6
5 2 7
Hard #7
9 2 4 7
4 2
1 6 9
1 5 3 9 8 2
8
7 6 9 1
1 8 5
5 6 3
8 2 4
Hard #8
3 7 8 1 6 2
1
9 4 3 1
5 2
6 1 7 8
6 8 5 3
8
2 7 8
1 9 8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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