Printable Hard Sudoku

Set 1eqj2sb. 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
1 7
9 6 5 1 7
7 4
6 1
5 3 6
7 4 9 3
6 2 3 7
6 2 4
1 7 5 6
Hard #2
5 9 8 7
8 1
1 6 5 3
8 6 9 4
3 9
9 7 8 6
5 4 9 3
2 7
2 1 6
Hard #3
2 3 9 1
2
1 2 7 6 9
2 4 5
9 3 7 8
8 5
6 9
4 2 6 1 3
8 4 9
Hard #4
2 7
9 4 5 2
6 9
1 6 3
4 2 6
5 2 7 4 3
7 6 9
8 3 5
1 5 2 8
Hard #5
7 6 4
3 7 2
5 6
6 7 5 3 1
2 9 1
1 9 8
6 7 2
4 3 7 6
1 2 9
Hard #6
6 8 5 3 9
5 7
3 7 4 8 6
4 1
4 7 9 3 2
5
1
9 7 4
2 5 9 6 8
Hard #7
2 8
1 8 5 9 2 6
2 8 4 3
7 3 1
2
4
8 4 9
9 7 4 3
2 3 8 1 4
Hard #8
5 7 8 2 4 6
3 9
6 1
6 9 8
7 1 5 6 4
3 9
6 5
4 8 1 7
3 9 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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