Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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