Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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