Printable Hard Sudoku

Set ym5lyu. 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 6 3
3 9 5 4 7
1 3 2 8
7 6
9 6 8 2
4 5 7
5 8 9 1
6 4 2
2
Hard #2
4 9 6
3 8
6 5
8 2
3 4 6 1 8
7 9 1 5 2
3 7 2
8 1 7
7 2 5 4
Hard #3
5 2
6 7 8 3
6 2 9
8 3 5 9
1 5 4
2 1 3
9 4 8 5 6
3 6 4 5 2
Hard #4
4 5
3 2 6 7
2
9 3 8
2 7 1 9
5 8 9 7 2
1 8 7 4
1 7
4 3 9 5
Hard #5
9 7
6 5 2
4 6 2 7 3
2 6 7 9
5 3 8 1
3
4 2 5
2 5
3 7 8 4 6
Hard #6
2 7 4
1
5 3 9 6
2 9 7 3
1 6 8 2 7
7 4 5 6 1
8
3 6 5 1
4 8
Hard #7
9 6 5 8
7 1 9
3 2 6
1 8 9 2 7
3 1 7 6
4 1
6 5 4
2
7 9 6 5
Hard #8
1 7 3 2
7 2 4 6 3
8
6 9 4
9 6 2 1
4 8
3 7
1 4 5 6
9 7 5 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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