Printable Hard Sudoku

Set i61i3e. 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
5 8 1
4 3 7 2 6 8 5
3
3 9 5 2
5
2 3 8 7 1
5 8
9 1 3
6 4 9
Hard #2
2 8 3
1 8 7
3 1 5
6
5 1 7 4
8 4 9 7 1 6
1 3
4 7 5 9 1
1 8
Hard #3
1 2 4
8 3
4 1 6 8
3 5 1 7
3 7 4
4 9 6 2
7 6 9
7
6 4 2 5 8
Hard #4
9 8 7 5 2
6 8
4 8 3 1 7
8 3 6 7
3 4 1
9 7
4 5
2 9
7 5 6 1
Hard #5
8 3 1 9
2 1 6 8
7 8 2
3 4
9 2 5 6
5 3
1
7 1 5 9 3 2
9 5 6
Hard #6
6 8
9 1
9 4
5 8 4
3 8 6 4
2 6 7
5 9 8 7 2 3
8 5 6 7
7 3 1
Hard #7
7 5 4 2
9 7 1
9 5
4 3 5 9 6
3 6 5 7
4
6 7 3 8 9
5 3
9 2 3
Hard #8
4 2
7 8 2
3 7 6
1 6
7 5 1
6 4 8 2 7 5
8 4 2
9 7 1 6 8
5 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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