Printable Hard Sudoku

Set u1iauc. 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 2 8
4 2 5
4 7
1 5 9 2 3
4 3 5
3 2 8 7
6 2 7 9
4 1 3
1 6
Hard #2
9 7 4
7 4 8 3
6 3 1 2
5 6 3 4
1 4 2 6
6 3 8 1
5 1
8 6 7
8
Hard #3
5 7 6
6 1 2
4 7 9 8
9 1 3
4 9
3 9 7
6 5 1
9 8
8 7 5 2 6 1
Hard #4
2 4 8 1 5
7 9
9 6 2
7 5
5 3 9 6
3 4
4 7 5 6 8
9 6 4 1
3 1
Hard #5
5 9
3 7 2 4
8 1 6 3
9 1 4 3
2 7 5
6 9
9 5 3 7
5 9 2 1
8 1
Hard #6
6 8 1 3
5 1 3
3 9 5
7 4 2
9 7 6 8
4 9 1 5
3 5 7 2
3 8
2 6
Hard #7
3 8 6 4 5
1 3 9
5 1 8
8 2
5 9 7 8
4 9
8 3 1 5
6 5
9 6 4 1
Hard #8
1 8 3 5
3 5 9
2 1
6 4 8
7 9 6 4
4 6 1 5
1 8 2
4 3 6
6 8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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