Printable Hard Sudoku

Set enrp21. 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
3 9 4
6 1 2 5
1 6 9 8 4
2 5
5 6 3 2
8 5 1 9
2 8 4 6
9 7
Hard #2
9 3 1
5
7 5 8 4
3 1 8 2 4
8 2 9 5
9 5
1 8
4 5 8 7 9
7 4 3
Hard #3
5
4 3 7 2 5
5 2 6 9 7
6 1 3 2 9 4
9 1 5
5 7
7 1 9
6
6 5 3
Hard #4
2 8 6
6 4 7 9 3
7 1 4
8 6
6 9 5 7
9 1 8
2 3
1 7 8
3 8 6 5
Hard #5
2 6 4 8
4 8 5 9
1 6 4 9
1 7 2 3
3 7 1 8
8 3 7
2 5 6 9 1
7
Hard #6
4 1 3 7
8 4 6 5
3 9 2
5 2
8 2 4 3 6
2 7 9
7 4
5 2
6 9 5 8
Hard #7
6 9 3 5
8
1 6 5
6 4 5 7
1 2 6 5
2 8
4 8 1
7 4 3
9 7 1 4 2
Hard #8
8
5 2 9
7 8 6 3
1 7 4 2
1 4 2 5
3 8
4 3 1 2
5 2 7
9 2 7 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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