Printable Hard Sudoku

Set 1x4bxrd. 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
4 3 9 7 8
1 4 6 5
1 8 4
1 3 7
6 7 8
9 7 2
2 6 5
5 7
8 1 4
Hard #2
4 6 7 8
6 7 3
7 8 4
2 5 6 9
3 2 5
3 4 8
3 9 8
5 7 9
1 2 3
Hard #3
3 9 1
2 1 6
6 9 2
8 4 7 6
9 4 2 5
8 7
7 9 3 8 1 4
8 4
4 5
Hard #4
4 1 5 8
6
7 3 4
7 8 5 3
8 2 4 7
5 9
5 9 6 8 2
7 3 6
1 5 3
Hard #5
5 6 4 7 3
2 4 6 3
7 2
7 2
1 4 3
8 1 9
1
1 2 4 5
7 8 5 9 6
Hard #6
9 6
8 2 4 7
4 7 2 1
1 4 7 2 5
3 6 9 4
7 4 6
3 8
5 1 9 2
8
Hard #7
1 3
9 3 7 4
4 2
6 3
5 9 8
5 2 6
5 7 3 2
9 4 5
1 3 2 7 9 4
Hard #8
7 8
1 8 5 4 2
3 7 4
5
2 7
6 9 1 5 3
5 2 9
7 1 5 3
4 6 8 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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