Printable Hard Sudoku

Set 1yf1hls. 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
2 5
6
3 6 4 9
7 2 9 4
4 9 1 3 6 7
1 8 5
3 1 6
1 4 2 9
8 7
Hard #2
7 8
2 4 5
6 3 8
6 8 2
1 9
3 6 7 5
9 1 8 7 5
8 5 1 4
3 2 8
Hard #3
7 1
9
1 4 3 5 6 8
2 8
3 2 8 6
5 6 1 3
3 5
6 8 7 3
9 3 4 8
Hard #4
1 2 6 8
9 1 4
5
5 9 7 4 2
8 7 3 5
3 8
1 9 4
2 1
3 2 5 8 9
Hard #5
4 5 1 2 6
9 4 5
7
5 6 3 2
2 4 8
3 8 5 1 4
7 2 9
4 3 5 2 8
Hard #6
9 5 2 1 6
8 6 3
1 9 2
1
4 8 2 9
1 9 2 5
9 3 4
3
6 1 7 9 8
Hard #7
2 9
9 4 6
5 9 1 7
3 4 2
9 4 7 3 1
6 8 9
9 1 3
4 7 5 2 9
8
Hard #8
7 8 6 5
9 2 8
6 5 7 4 3
9 8
7 5 9 2
3 8 9 7
1 4 6
7 2
4 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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