Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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