Printable Hard Sudoku

Set 3lta25. 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 7 4 8
7 3 6
6 1 4
3 8 2
4 5 6 2 3
6 1
2 9
2 1
4 1 3 9 5
Hard #2
4 1 8 7 5 3
2 1
4 5 9 6
4 8 9 1 3
9 2
5 9
8 5
3 4 5
2 6 7
Hard #3
2 4 8 7
7 1 6 2
9
3 9 8 4
4 5
1 6 8
8 5 3 7 9
9 8 1 6
4 5
Hard #4
6 4 2
2 9 8 7
7 6
7 6 8 9 5
3 2 6 8 5
5
6 4
8 5 6 1 9
5 3
Hard #5
4 1
9 2 7 1
8 5
9 2
7 4 9
2 5 4 8
5 3 2 9 8 1
1 3 7 6
7 1
Hard #6
3 8 7
4 5 1
7 2 9
3 1 2 4 8
9 2 7 3
4 2
4 9 5
1 8 4
2 6 8
Hard #7
2
2 9 7
7 6 5 9 8
6 8 3
4 3 7 9
2
4 1 7
5 6 2 1
5 8 2 3 4
Hard #8
5 4 6 9
9 7 2 3
3 5 8
4 7 2 8
9 2 1 3 6
6 3
6 3
3 5 7 4
9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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