Printable Hard Sudoku

Set 1o02vlo. 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
9 8 3 7 2
3 6 1 5 8
2 1 5 3
1 3 7
5 9
1 8 2 7 3
6 2 4
4 1
Hard #2
6 5 9
2 6
8 5 6
7 4 2
4 3 2 1 8
6 4 7 3
1 4
3 5 6 9
7 6 2
Hard #3
2 8 4 5
2 7 6
6 4 7 1
6 4 5
8 9 2 6
8
9 1
3 2
4 6 8 9 3 1
Hard #4
2 8 7 3
1 2 9
3 9 8 7
6 5 4 7 2
5 8 3
8 5
2 5 3 7
8 1 4 6
Hard #5
7 9 6 4
4 9 7
1 5
2 7
1 2 3 5
3 5 2 8
9 7 8 1 5
8 6 7 2
4
Hard #6
4 5 7
5 4
9 5 8 7
2 6 5 9
5 4 1 7 3
8
9 8 6
7 3 1 6
2 5 4
Hard #7
8 5
2 4 6 8
1 2
1 8 2
3 7 5
2 5 3
5 3 4 1 8
1 2 9
6 9 7 5
Hard #8
2 6 8 3 1
1 5 8 4
7 8 1
2 4 6 5
8
5 3 7 6
9 1
2 6 4 7
4 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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