Printable Hard Sudoku

Set ufq3y. 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
6 3 1 8
6
7 5 9 2
8 5 1 4 6
9 5
2 3 8
4 1 3
8 4 9 2
2 8 3
Hard #2
5 8 1
7 6 3
6
1 5 3 4
9 5 7 1
7 2 8 1
9 7 1 3
4 6 3
3 7 1
Hard #3
3 8 5 9
2 7 1 6
9 5 4 1 3
5 9 2
6 3 8
4 7 6
3 8
2 5 7
1 6
Hard #4
2 3 1
1 6 3 9 2
5 9 4
6 2 7
8 2 3 4
5 6 1 2 3
5
2 8
4 1 3
Hard #5
5 3 9 8
2 9 4
6 3 2 5 7
9 8 6 7
7
2 9 1 6
1 2 8
4 3
5 8 9
Hard #6
3
6 1 4
8 7
9 1 5 4 6
2 5 9
8 4 7 1
7 5 6 2 9 1
2 3 9 5
8
Hard #7
1 9 8 7
3 4 2
3 6 9
5 2
4 2 1 5 8 6
6 4
8 9 5
1 5 9 6
7 1
Hard #8
8 6 3 2
3 4 6 9
5 9 8
3 6 7
7 9 5 3
2 7
5 9 4 1 3
6 2
1 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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