Printable Hard Sudoku

Set 1wl3jn0. 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 2 3 7 4
4 8 5
8 1 9 6
3
7 3 8 6
4 2
4 6 3 5 2 8
2 7 9
9
Hard #2
8 6 2
6 1
1 9 4 2
8 5 4 7
9 4 2
2 3
4 9 3
1 7 8 4
6 5 9 7
Hard #3
9 2 5
8 3 1
3 4 5
1 3 8 2
8 5 7
9 2
7 5 8 1
4 1 3 5 9
5 7
Hard #4
1 3 5 2
8 3 7 9
2 3 8
6
3 4 5 1
9 2
5 4 1 2 6
3 2 9 5
6 1
Hard #5
1 9 4 7 8
4
5 3 2 1
7 4 8 6 9
9 4 8
3 5 4 7
7 5
8
8 2 3 9
Hard #6
4 6
7 3 5 2
6 1 5
2 9
5 3 2 7 8 1
1 4
2 7 9
3 1 4 7 6
3 8
Hard #7
7 8 2 5 4
9 1
3 1 5
6 9 4
5 4 3
6 8 2
8 3 7 4 1
5 9 8
2 3
Hard #8
9 5
7 5 1
6 8 3
4 3
2 9 5 1
8 6 5 1 7 4
1 9 8
7 8 4 1 9
2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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