Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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