Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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