Printable Hard Sudoku

Set 1n4o7eo. 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
4 7
6 7 2
8 3 5 6 2
3 2 1
6 7 3
4 6 9 5
9 1 2 8
2 6
8 5 1
Hard #2
6 1 5
3 2 4 6
2 7
9 8 7 6 1
4 5 8 2
2 4
1 3 8 6
5 4 1
7 9
Hard #3
3 5 6 8 4 1
2 7
5 2 8
9 8
4 5 3
7 2 3 6
5
2 1 4
6 1 5 9 8
Hard #4
3 2 6
1 8
6 9 7
7 8 6
8 1 6 7 5
2 4 1
6 1 9 8
5 7
5 3 2 1
Hard #5
1 8 2 7
2 5 3
5 6 7 1
3 2 6
5 9 8
7 4 2
3 7 6 1
9 7 6 4
4
Hard #6
4 7 3 9
1 5 2
2 8 1 6
5 1 9
2 9 6 1
3 4
3 7 9
2 9 5 4 3
8
Hard #7
3 2 7 5
4 7 5 2
2
5 1 3
3 7 1 8
1 8 3 7
1 2 5 6
1 6 3 9
8
Hard #8
7 5 9 6
7 1 4 8
8 4
7 8 9 5
8 1
9 1 2 4
4 1 2
1 5
5 3 9 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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