Printable Hard Sudoku

Set 1rsif7c. 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
3 5 8
5 6 2 8 1
7 3 2
3 4 9
2 6 5 3
5 8 2
9
9 7 2 1
3 8 5
Hard #2
8 3 9
2 7 1
4 6 7
3
3 8 9 7 1 6
8 4 6 2
5 8 1
6 2 1
9 5 4
Hard #3
4 5 8
3 8
2 1 5
1 3 5
8 7 1
9 3 7
8 4 9
7 4 5 6
6 2 8 4 1
Hard #4
7
6 2 7
5 8 1 9
6 3 5
4
2 7 1 6
9 5
4 5 8 3 1 2
3 2 6 8 4
Hard #5
8 2 9 7
8 6 1
6 5
1
1 9 4 2 8
2 7 4 9
4 6 8
2 1 5 6 4
8 1
Hard #6
1 4 5 2
9 2 7 4
7 6
7 2 9
1 6 2
2 5 9 4 8
2
8 1 5
6 8 3 4
Hard #7
9 6
2 7 4
5 3 2
7 5 2 6 8
6 7
3 8 5
4 1 8 2 7
9 4 8
5 9 3
Hard #8
6 4
7 6 1 9 2 3
4 1 7
5 8 4 6 3
3 5 7
5 2 1
2 3 5 9
3 6 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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