Printable Hard Sudoku

Set 1re4nsj. 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
8 3 7 2 6
4 8 2
7 8
3 4 6 9 7
5 7 6 8
9 3
7 9 3
2 6 5
1 5
Hard #2
2 1 4 8
5 9
9 8 7 4
9 7
1 7 4 3
4 8 5
1 7 4 3 6
4 1
2 5 6
Hard #3
6 4 7
7 8
8 3 6 4
9 8
5 8 9 4 3
2 6 4 1 5
1 9 3 6
5 1
4 2
Hard #4
5
8 9 1 2
1 2 7
9 3 1 5
1 5 7 6
4 2
6 9 1
7 6 2 1 5
4 3 9
Hard #5
4 6 3 7
7
2 5 4 6
3 6
8 3 1 9
2 8
5 9 1 7
6 1 4 9 7 3
6 5
Hard #6
4 3
8 4
5 4 3 2 1
9 6
6 5 3 2 4
8 1 4 6
5 6 1 7
2 5 7
4 9
Hard #7
9 7 1 4
5 3 7
1 4 2 6
8 5 6 2
9 5
1 7 9
6 4 2
5
4 9 1 8 3
Hard #8
2 5
9 5 3 4 7
3 8 4 9
2 5
7 9 1 2
1 7
4 2 7 3
5 8 7 9
9 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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