Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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