Printable Hard Sudoku

Set 1tfpto2. 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
5 7 9
9 6
8 4 2
4 6 8 2 1
2 3 1 5 6 7
9 8 4
8 7 9 1
5 3
4
Hard #2
8 1 4 5 6
4 3 6 7 8
7 9 4
7 6 9 5
8 3 7
9 3
2 5 9
3 4 6 5
Hard #3
7 3
2 9
5 9 8 3 6
3 1 7 5
4 8 2
4 6 7 9
8 3 9 4
1 2 8 3
9
Hard #4
7 8 1
5 9 3
8 7 1
8 2
9 6 4 1
3 7 5
1 7 6 8
7 4 9 8
6 9 3
Hard #5
6 5 7 2
9
7 2 6 5 4
8 3
5 9 3
8 4 2
4 9
8 5 6 7 2 4
7 2 1
Hard #6
3
7 4 6 5
9 3 4 8
2 9 7 8 6
8 6
6 5 4 2
3 1 4
1 2 5
8 3 9
Hard #7
7
2 6 5
5 3 8 7
4 6 9
7 1 9
9 7 4 3
3 5
1 9 5 3
9 3 8 7 2
Hard #8
1 7 8
5 3 4 7
2 4 5
3 8
1 6 2
8 9 3
6 8 5 1
9 7
7 5 4 6 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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