Printable Hard Sudoku

Set y668e4. 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 9 1
4 7 8
2 7 3 5
8 4 9
6 1 8
2 8 7
4 3 2
7 3 9
1 7 4 2
Hard #2
7 6 1
8 3 2
1 3 2 8 4
1
8 4 6
1 9 8 2 7
3 6 5 1
2 4 3
4 5
Hard #3
2 9 7 8 6
8 3 9 1
2
2 9 7
3 5 7 1
6 4 2
2 1 5 6 3
6 8
2 4
Hard #4
1
3 6
3 5 6 9 2
7 4
1 8 9 3
7 4 9 1 8
1 4 9
6 5
4 2 8 5 3
Hard #5
5 2 6
4 5 6
3 8 1
8 4 7 5
2 9
2 6 7
1 8 5
5 3 2 7 9
7 6 8
Hard #6
2 5 8 9
8 1
6 5 9 7
1 7 9 3 5
3 9 1
4 8 3 2
7 3 8 5
2
6 5
Hard #7
4 5 1
9 6 8
5 1 9 2
7 5 6
1 7 6
6 8 2 3
1 7 2
5
3 7 8 1 4
Hard #8
8
3 4 5 6 2 1
9 2 4
7 6 4 5
3 8 1 5
8 4 6
5 9 7 2
4 1 8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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