Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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