Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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