Printable Hard Sudoku

Set 19lsexi. 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
9 8 7 2
4 9 7
1 5 4
7 5
9 8 5 2
2 3
6 5 9 2 1 4
1 4
7 6 5
Hard #2
4 1 8
6 9 1
1 4 2 6
1 9 4
7 3 6
8 2 7
4 2 7 3 9
1
5 1 9 3
Hard #3
9 7 2 1
3
4
3 9 4 8 2 6
6 2 3 7
2 6 7 1
6 7 1 5
4
2 1 8 6
Hard #4
3 4 6
9 3 2
7
1 2 4 3
8 7
3 1 5
3 4 9 6 8 2 1
2 1 9
3 6 5
Hard #5
1 9
7 2
5 7 4 2 9
6 7 8
2 6 5 4
7 3 1
6 4
2 4 7 9
9 1 7 8
Hard #6
5 9 3 7
7 3 9 1
6 5
4 3
6 2
1 9 6 2
6 3 8 9
3 9 7 2 4 5
1
Hard #7
4 5 8 6
1 9
9 6
2 7 3
5 1 3
1 9 5 2
6 7 8 2
8 3 6 4
4 9 8
Hard #8
4 6 8
5 4 2
2 6
3 7 6 5 8
7 9 5
4 1
1 6 2 7 9
9 7 8 2
5 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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