Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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