Printable Hard Sudoku

Set a1ev2q. 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
1 9 4
2 7 4 6
5 7 2
2 3 6
8 4 5
4 9 6
9 3 1 8 7 4
3
7 1 2
Hard #2
1 5 9 3
7 3 8 5
2 1
1 5 6 8
5 9 6
2 7 4
3 8
6 7 4 9
3 5 4
Hard #3
2 6
6 5 7 2
9
4 2 5
1 8 7 6 4
3 9 6 2
1 7 5
3 4 1 8 9
5 3
Hard #4
3 8 6
6 4 7
5 2 9 3
5 4 2
1
4 3 9 7 2
6
8 4 5
9 7 6 5 3 4
Hard #5
7 9 6 3 1
5 8 1 9 7
2 6
6 2 7
5 4 9 2
3
7 6 4
5 7
9 7 3 8
Hard #6
6 8 1
2 3 4
7 4 5 2 6
1 9 5 3 7
6 7 8
5
9 5 1
7 5 4
4 9 2
Hard #7
1 7 3 5
4 5 7 3
2 7 1 5 4
7 4
5 2 8
8 1
5
9 4 2 3 6
7 6 4
Hard #8
5 1 3
2 4
1 4 6 3 8
5 2 7
3 1 7 5
6 3 8
8
6 4 9 5
1 9 5 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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