Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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