Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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