Printable Hard Sudoku

Set 63alyx. 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
4 2 8 9 1
6 7
4 9 2 6
8 5 4
9
6 3 1 8 4
1 3 9 7
8 4 3 5
6
Hard #2
2 9 5
6 8 9
5 6 2 8
5 2 4 6
3 7
1 8 5 7
3 8 9
1 4
3 4 6 2
Hard #3
6 3 4 9 2 7
4 1 9
9 6 7
2 8
6 1
9 2 8
4 2 5 6
3
9 8 5 1 4
Hard #4
5 2 6 1
6 1
2 9 3
9 3
3 7 8 4 5
8 1 9 3
4 5 7 9
8 7
6 1 8
Hard #5
2 6 3 4
3 1 4 6
9 7 2
8 3
9 8 6
2 7
6 8 5 7 1
5 7 8
1 8 3
Hard #6
1 8
7 4 6
9 7 4 8
3 7 8 2
2 1 9
9 2 3 6 1
2 7
1 3 6
5 9 3
Hard #7
7 3 6
5 9
9 2 6 4
6 8
2 3 4 6 1
4 9 6 1
4 9 7 5
1 8 7 9
4
Hard #8
2
9
1 3 9 4
4 6 5 9
1 2 6
2 4 1 7
5 7 6 8 9 2
2 8 3
7 9 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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