Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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