Printable Hard Sudoku

Set ety00q. 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
5 6 1 2
8 9 5
3 9 2 5 1
7 9
7 9 5 3
8 6
9 5
7 8 3 1 9
1 8
Hard #2
7 8 4
2 5
5 1 3 8 7 9
2 7 6
3
3 5 4 1
9 3 8
4 1 6
8 5 7 4
Hard #3
2 4 3
7 6 8 1 5
9 8 7 2
4 3
1 5 3
5 6 4 8
8 7 9 1 3
2
8 7
Hard #4
7 6 8
8 2 7 5 6 1
9
4 6 1
1 2
2 3 5
3 7
8 7 4 2
5 8 1 3 6
Hard #5
4 6 9
7 1 5 4
9 3 8 7 1
5 8 3 2
7 5 2 3
3 2 4 7 5
3 7 4 8
Hard #6
4 1
5 8
8 6 3 2 4
7 4 2
9 7 6 5
3 4 1
2 7 1 9 3
5
6 9 4 1
Hard #7
5
7 5 3 1 9
4 1 2 7
6 3 7
8 9 3 5
2 1
9 1 3 8 6
2
8 2 6 1
Hard #8
7 6 3 9
1 2 8 9 7
2 8 6
5 6 7
1 7 6
3
8 9
2 4 5 9
6 4 2 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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