Printable Hard Sudoku

Set 1gg5dcf. 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 4 2
9 1 5 7
9
2 4 3 8 9
3 5 2
2 1 7
9 4 2 8
5 2 4
8 6 7
Hard #2
8 6 3 2 1 4
2 4
7 3 6
2 6
9 1 3 2
3 7
4 9 8 3
1 3 5 4
9 7
Hard #3
5 4 1 7 3
1 4 7 9
8
3 2 8 1
4 2
7 8 9 3
4 9
5 3 8 6 9
1 5
Hard #4
9 3 7 4 2
6 5 3 8
1 4 6
5 6 2
8 3 4
9 8
5 1 8 6
2 9 7
2 1
Hard #5
1 9 4
8 3 9
9 7 2 5 3 1
3 4 2 7
5 6
5 9 6 1 4
6 7
5 3
1 9
Hard #6
7 4 1
2 6 7 9 4
4 2
1 7 4
3 9
8 2 3 5
3 4 8 7
5 6 9
8 6 5
Hard #7
9 1 6 7
5 4 9
8 2
2 6 8 4 1
8 9
4 3 6 5
8 5 6 1
4 8 9 2
3
Hard #8
4 1 2 9 8
2 7 4 3
3 5 9
8 9 7 2
9 1 4
5 2
3 6 2 5
2 7 5 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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