Printable Hard Sudoku

Set 1lo62ls. 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
9 3 1
1 2 5
6 5 7 9 4
8 4 1 2
5 4
7 8 4 9
8 6
5 2 8
1 6 3
Hard #2
9
2 5 4 6
3 8 2
1 9 3 6
8 4 5
9
2 3 6
2 7 3 4 5
6 3 5 1 8
Hard #3
2 4
3 5 2
4 5 3 9 6
5 6 4 8
8 2 9 3
2 7 1
7
3 4 1 7
6 9 4
Hard #4
2 8 4 3
3 1 7
6 9 8 5
5 8 4 3 2
1 5 4 9
4 6 1
9
2 5 6
2 3
Hard #5
1 7
3 8 4 5 6 1
4 5 2 8
9 4 8
9 8 1
6 7 2 9
7
3 1
8 6 2 4
Hard #6
6 7 4
3 7 5 1
8 5 2 7
1 2
7 9 3 1 5
4 6 2
9 5
4 2 9 3 7
6
Hard #7
5 4 1
8 2 7 5
7 9 6 8
8 4 7
1 6 7 9 8
2 6
5 7 8
4 3
6 9 5
Hard #8
4 3 1
6 1 8 5 7
9 6 5
1 6 7 3 2
9
6 1 8 4
3 8
5 2 4 6 3 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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