Printable Hard Sudoku

Set jl33j1. 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 7 8
2 5 8
2 5 6
4 8 6
7 6 9
2 7 3 1
6 1
9 3 4 6
5 7 4 9
Hard #2
8 9 3
5 2 6
3 6 8 4
4 5 7
2 7 1
6 9
8 3 2
9 5 6 1
1 9 4 6
Hard #3
4 8 9 2
7 6 1 3 2
4
6 5 7 4
1 6 9 3
3 1
4 2 9 3
2 9
3 8 1
Hard #4
5 3 9 7
1 5
1 7
2 9 5
5 7 4 6 1
3 6 8
9 6 7
2 4 9
6 8 3 4
Hard #5
2 7 3
5 9 7 1
7 4 6 8
3 1 5
6 7
2 5 8 6
4 2 3 6
6 8 7
2 1
Hard #6
1 8 5
4 7
5 1
2 6 7 1 9
1 5 9 6 2
9 8 4
3 4 7
5 2 8
4 5 6
Hard #7
6 9 4 1
8 1
5 8 9 3
9 2
3 7 1
4 1 6 2 3
7 2 9
9 7 1 6
3 8
Hard #8
6 5 2 4
2 1 5 9 3
8 9
3 2 9 6 1
7
1 4 3 5 7
6 2
9 6 7 1
3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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