Printable Hard Sudoku

Set bt2yby. 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 8 2 1
4 8 2 3
6 1 4 7 3 5
9 6 3
4 1 7
9 6 3 2 8
5 6
3 4
Hard #2
4 2 8 7
7 3 2
5
7 1 5 9 3 6
3 6 1
1 5 9
5 9 8 7
1 5
4 3 8
Hard #3
1 4 8 6
7 4 3 2
3 2 7
8 6
4 9
7 8 5 2 4
3 5
2 9 8 5 1 4
2
Hard #4
9 8 1 7 3
8 9 2 4
3
7 1 2 8
4 8 3 9 6
2
5
6 8 7 3
6 2 5 1
Hard #5
6 5 8
4 7 2 5
3 5 4
2 8 9 6
6 9 3 7
8 7 9
7 1 4 2 8
9
9 7
Hard #6
6 1 9
5 4 7
7 1 8 5
3 9 6 2
5 9
2 7 4
6 1 3 7 4
9 6 3
2 7
Hard #7
8 1 4
5 2 8 1
3 8 9
8 6
1 2
9 8 1 3
4 8 6 3 5
5 3
5 1 2 9
Hard #8
1 7 9 6
9 2 5
3 7 6 9 4
2 5 6
4 3 7 2 8
9 3 1
6 5
6 7
7 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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