Printable Hard Sudoku

Set 1yyi4zw. 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 7 1
1 9 3 4 8
9 4 6 7
3 8 2 1
7 1
6 9 2
3 7 5
8 9
3 1 2
Hard #2
7 6 2 1 5
8 9 5
5 9 8
1 8 2 7
7 4
9 1 3
6 4 7 5
4
7 8 4 2
Hard #3
9 4
6 1 7
5 6
4 5 6 7 3
4 5
3 8 1
5 9 8
1 4 8 3
6 8 1 9 7
Hard #4
3 6 9
3 8 2 1
5 3
7 1 5 2 3
5 6 7 9
1
2 7 6
3 2
6 7 1 9 8
Hard #5
3 1
5 9 8
2 5 7 1
7 2 6 8
5 9 1 3
8 2
7 1 2 6
3 2
3 5 4 1
Hard #6
2 8
9 7
5 4 8 1
1 5 8
5 6 4
6 8 3 5
4 6 3 8 1 7
2 6 9
5 4
Hard #7
2 6 8
8 4 1
9 3 1
5 3 7 4
9 3 2 6
4 5 1
1 5 2
4 8 1
5 6 4
Hard #8
6 5
4 6 9 8
8 9 6 1
4 5 1
9 3 6
2 1 9
7 1 2 9 6
3 7
8 7 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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