Printable Hard Sudoku

Set 1ll06tk. 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
9 4 3
8 4 2 3 7 5
3 5 1 4
6 7 9 3
8 1 2
3 4
6 1
2
4 2 8 1
Hard #2
7 8 4
3 4 6 5 1
1 9 3 2
4
6 7 9
3 8 7 1
4 3 2 6
3 1 8
6 5
Hard #3
4 1 6 8
3 4 9
8 7 9
3 9
2 5 4
1 9 2 5 7
8 5
4 2
5 6 8 3 4
Hard #4
8 4 3 6 1
7 3 8 4
6 9 4 5
7 1 9
5
2 5 7 8
6 9 7
2
5 8 9 4
Hard #5
1 5 6
9 5
6 7 5 8
4 3 9
6 2 1 3
3 8 7 2
7 9 6 5
9 1 8
2 5
Hard #6
6 9 1
4 9 7 2 5
6 9
8 9 7
7 8 2 4
8 1
4 6 5 1
5 3 7 2
4 5
Hard #7
1 5 6
8 1 3 2
2
4
6 3 9 5
2 1 6
8 1 7 5
7 9 6 1 2
5 8 4 1
Hard #8
4 9 1
3 6 2 7
4 6 3
9 8 5
2 1 9 4
3 5 7
6 2 5 3 1
7 4 3
1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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