Printable Hard Sudoku

Set p09br2. 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
8
7 6 4 5 1
1 3 8 7
2 5 7 1
9 7 5
6 2
4 5 3
7 8 2 9
8 9 4
Hard #2
6 4 3 1
6 3 1
9 2 8 6 4
4
7 4 1
2 1 8
6 3 8 5
9 3 8 7
1 9
Hard #3
1 5
5 2
8 4 3
1 6 3
9 1 4
7 6 2 1
3 1 2 8
3 9 5 4
8 6 4 1
Hard #4
1 2 5 6
1 9 7
2 8 1 9
6 9
9 3 7 5
3 7
1 4 3 8
8 6 7
5 9 1
Hard #5
4 1 7
9 3
7 3 6 1 2
5 8 3 1
1 7 8 9
7 9 4 6
4 2
1 5
5 6 7
Hard #6
8 2
4 6
1 2 3 5 6
3 2
6 2 3 8 9
8 5 3
7 9 6
6 7 1 8
5 8 9
Hard #7
2 1 7 9
8 1
9 3 6 2
1 6 5 7
5 4 7
8 4 7
3 2
7 5 9
2 6 9 8
Hard #8
4 7 3 1 9
8 5
5 9 6 2 8
1 8 5 6 3 2
7 3
4
2 5 6 1
5 2
9 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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