Printable Hard Sudoku

Set olbn0x. 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 1 4 2
8 4 3 5 9
6
5 3 9 8 4
7 3 1
6 4
9 5 1 3
5 4
2 1 8
Hard #2
5
7 3 8 1
1 4 3
9 4 6 5 3
8 2 9
9 5 3 4
6 7 1 5 3 9
1 5 9
Hard #3
5 3 6 2 1
1 9 8 5 6
9 1 4
6
3 8 2 1 5
3 1
7 9
6 7 1
2 4 8
Hard #4
1 8
2 3 5
5 9 6 7
5 1
6 2 4 3
3 1 8 7 6
3 8 6 1
5 2
7 3 9
Hard #5
8 1
2 1 9 8
6 5 3 9
2 5 6 7 8
7 8 9 3
1 8 9
8 4 6
2
9 2 7
Hard #6
9 2 4 6
8 6
4 7 1 9 2
4 1 3
9 1
2 8 9 7
7 5
5 2 8
9 6 4 2
Hard #7
2 8 6 9 1
3 2 4
1 4 7 8
5 1
3 7 5 8
4 5 1
4 8
1 9 7
9 7 6
Hard #8
8 6 7
4 1 3
1 3
8 5 6
2 5 3 8 4
9 4 8
6 8 1 3 2
1 3
7 4 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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