Printable Hard Sudoku

Set 1rll4e3. 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 6 3 5
6 7 4 8
3 4 8 2 1
7 1 5
8 9
6 3 9 5
5
7 9
8 4 1 2
Hard #2
3 4 9
8 7 2 4
5 7
8 7 9
6 2 7
5 6 1 8 2
8 9 3
1 7 5
6 2 4
Hard #3
9 5 1 8 6
5 6 3
3 4 5
3 6 1
5 4 6 2 9
3 8
7 9 8
4 2
5 7 2
Hard #4
3 7 5 1
7 9 4
4 2 5
3 7 6 1
6 8 1
9 1 3 4
1 2 8 9
6
2 5 1
Hard #5
8
3 5 7
7 1 6 2 9
2 4 9
8 9 1 5 6
7 2 9
3 2
9 5 1
6 7 5 9
Hard #6
5 1
6 8 4
9 3 7 8
3 1
4 6 8 7
7 9
7 8 2
6 2 7 9 8
8 3 4 1
Hard #7
7 4 3 1
9 7 5 4
4 9 2
7 4 2 1
3 5 9
5 7 8 3
3 9 4 7 5 6
1
Hard #8
4 8 7
9 1 6
3 5 6
6 1 5
8 6 2
9 4 8 2
5 3 8
6 7 8 9 1
2 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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