Printable Hard Sudoku

Set oaixc5. 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
3 4 1
7 2
3 2 9 7
5 1 4 3 9
8 7 5
8 4
2 5 3
9 1 7
2 4 9 8
Hard #2
2 6 8 9 7
7 3
4 5
2 4
4
8 5 9 6
1 9 8
8 2 7 5
4 6 7 3 1 2
Hard #3
3 1
4 9 3 8
8 1 2 5
9 8
4 1
7 1 6
9 4 5 8 6
2 6 4 7
7 9 2
Hard #4
9 6
1 7 4
8 4
2 8 7 1
5 7 4 2
1 3 9
8 6 9
6 9 2 7
3 2 9 7
Hard #5
3 4 6
1 9 8
5 2 1
7 4 6
4 8 1 5
6 2 5 7 3
5 6 2
3 8
2 7 4
Hard #6
6 8 1
3 5 7 2 8 4
2
6 1 4
4 9 1 5 3
3 5
8 9
5 8
8 6 1 9 3
Hard #7
8 4 1 5
9 3 5 8
5 6 4 3 1
2 8 4
7 6
3 2 9
8 4 6
6 3 1 9
2
Hard #8
4 1 2 8
5 4 2 3
3 6 2
3 8 6 2
3 5 1
8 2 1 7
3 7
5 1
6 2 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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