Printable Hard Sudoku

Set 1wrbbe2. 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
2 3
9 7 5
6 3 7 8
3 6 1 9
2 9 8 4
6 5 8
4 1
3 4 9
2 1 7 5
Hard #2
2 6 5 4 8
4 6 9 2 1
8 6
5 9
9 1
3 9 8 5
8 5 3 4
4
2 7 8 3
Hard #3
6
8 6 5 1 7
9 1 3 8
7 2 8 6
4
4 1 6 3
5 4 2 3
7 4 6
9 8 5
Hard #4
3 2 9 4 6
8 3
5 9 6
8 1 6
3 6
2 1 7 8
5 7 3 6
8 3 2 7
1 5
Hard #5
6 3 8 4
9 4 2 1 5
1 4 7 6
8 4 7
4 9
9 8
6 1 4
6 7 8
5 2 1
Hard #6
3 7
8 5 1 7
6 1 2
9 1 7
7 4 8
1 2 6 9 3
2 4 6
3 4 8
5 8 9
Hard #7
5 6 1 9
8 4
1 7 4 3
2 6
2 3 9 7
3 7 9 1 5
9 7 5 6
7 3
5 8
Hard #8
2 5
4 8
1 3 4 6
3 4 5
6 5 1 2
8 3 7
1 2 8
7 9 1
5 3 1 7 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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