Printable Hard Sudoku

Set 1u5qmbx. 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
4 9
3 7 1 2 4 8
8 9 3 5
9 6 1
4
4 1 8 9
1 9 2 6
6 7
2 7 3
Hard #2
7 8 4 1
3 1 6 2
2 6 5
5 4 8 7
6 7 9
9 1 3 2
9 3
8 4
3 7 8
Hard #3
3 6 2
6 2 1
5 8 4
9 7 1 5
2 6 3 9
5 8 2
5 8 1 7 4
9
8 4 9
Hard #4
2 7
3 6 5
5 7 4 8 2 1
1 3 9
1 3 4 8
2 4
4 8 2
5 1 2
6 1 4
Hard #5
8 4 2 7
7 6 5 8
5 8 9 1
2 8 7 6
3 1 8 7
7
4 5 2 7
2 8
1 3
Hard #6
1 3 9 8
5 4 3
4
2 7 9 1
3 5 1 2 6
1 7
9 8 2 5
5 4 1
8 4 3
Hard #7
7 1 3
3 6 9 5
2
2 1 3
9 1 3 2 6
3 9 4 8
8 3 4 5 2 7
4 7 1
Hard #8
7 4
5 3 9 4
1 5 2 6
3 8 1 9 5
2 8
7 3 1 2
2 7 9
8 5
7 4 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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