Printable Hard Sudoku

Set 1lptlf7. 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
3 7 9 8
5 8 1
1 8 3 9
9 4 3 6
2 8 9 7 4
9 4 1
6 3
7 5 6
Hard #2
2 5
2 4 1 9
1 8 7 6 2
4 7 9 5 8
3
7 2 4
7 5 1
5 9 7 3
4 7
Hard #3
8 1 4 6
3 7 8
2 8 6 7
4 2 7
6 5 1 9
7 9 3
5 1 6
2 7 3
7 5
Hard #4
9 1
8 5 9
7 3 6
8 7 1
3 7 2 9
2 8 4 7
4 2 3
2 9 3 4
6 2 7
Hard #5
5 9
7 1 6 4
6 3 2 9
2 5 8
9 4 6 1
8 5 9
2 4 3
2 6 5
1 8 5
Hard #6
8
2 3
2 9 1 5 3 4
6
5 1 4 6 8
3 2 9
3 8
2 7 9 4 5
4 1 6 7
Hard #7
1 7 8
4 7 1
2 4 6 5
1 3 5
8 9 2
9 8 7
1 9 7
5 1 3 7 8
4 3
Hard #8
7 3
3 8 9 4 2
9 6
5 1 8 7 3
3 7 5
4 1 2
7 9
2 5 9
9 2 4 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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