Printable Hard Sudoku

Set lcept7. 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 7 5
9 1 4
2 1
6 7 1
7 5 2 9
6 2 8
3 2 5 8 9
5 2
4 6 5
Hard #2
9 7 3
3 9 5 8
2 4 9
5 6 1 4 7
3 5 6 1
1 8
3 5
9 1 7
6 3 8
Hard #3
1 9 6
9 7
6 3 2 8
1 6 9 2
8 1 4
9 8
5 2 8 7
3 6 7 5
4 5 2
Hard #4
4 8 9 6
6 5 2
2 1
8 6 5 2
4 8
2 1 5 6 9
7 6 1
9
1 9 8 7 3
Hard #5
2 5
9 3 5 4
6 3
4 6 9 7 5
9 5
2 7 1 3
3 8
8 5 2
7 2 6 3 1
Hard #6
7 9
2 6 3
4 9 2 8
6 8 1
8 9 4 1 6
3 7
2 6 5
7 5 3
4 1 9 6
Hard #7
8 3 4 9
1 5 3 8
9 2 1
8 5 6
7 3 2
7 4
3 2 1
9 1 3 5
1 4 8
Hard #8
5 9
4 5 3 2
9 2 7
1 3
5 8 3 9
2 6 7 1
5 6 4 2
2 9 1 8
6 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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