Printable Hard Sudoku

Set ux550i. 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 6
7 3 2
8 9 3 1
2 7 3 6
6 9 1 4
4 9 8 5
5 8 9
7 1
6 2
Hard #2
6 9 1 8 7
8 7 2 3 6 1
4
7 5 6
5 3 1
8 4 6 2
4 8
1 9 5
2 9
Hard #3
8 7 9
9 6 4
3 1 7 2 8
2 9
5 7 6
1 3 2
7 8 4 1
1 4 6
8 9 3
Hard #4
6 3 5 1 8
7
9 4 7 5
1 2 9
2 3
9 4 3
5 4 6 7
7 2 6
1 7 8 9
Hard #5
4 9 6 8
8 1 2
4
2 3 8
7 4
9 8 1 5 6
5 7 2 9
1 9 7 8
3 2 6
Hard #6
3 2
8 3 9 4 1
1 6 4 7
7 6 9 2
1 2 6
6
4 7 9
2 8
2 8 5 3 9
Hard #7
2 7 5
5 3 4 6 9
8 5
7 3 6
9
2 1 4 5 3
2
1 3 4
4 6 7 5 3 2
Hard #8
3 5 2
1 7
3 5 1
7 2 4 5
5 9 4 7 6
2 8
9 1
6 4 7
6 7 9 3 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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