Printable Hard Sudoku

Set jl0k4p. 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
2
1 7 9
9 8 7 5
1 7 2 6
6 9 5 4
8 5 4 7
2 6 4
4 8 6 1
3 7
Hard #2
4 2
3 9 7 6
8 9 4 7
2 6
5 4 7 1
6 8 3 5 2
8 6 2 5
2 9 1
1
Hard #3
8 2
8 9 2 4
9 1
6 1 7 4
1 3
3 4 2 8 5
3 5 7
9 6 5
8 7 4 9
Hard #4
1 6 8 7 2 9
2 1 9 8
4 2
8 4
9 6 3
7 8
2 5 1
3 2
9 7 6 1 2
Hard #5
8 6
3 2 5
1 3 8 7 4
4 8 6 3
3 5 1 8
7 5 1
5 2 4
4 7 5 9
1
Hard #6
7 9
2 8
8 5 2 9
8 9 7 5 1
5 1 3 2
9
2 3 6 9
4
2 6 4 9 5 1
Hard #7
3 1
4 6 8 7
2 4
6 8 3 9
1 2 8
3 5
2 1
6 8 4 7
3 7 5 9 4 6
Hard #8
7 5 4
4 1 7
8 3 9
2 9
1 8 6
8 6 3 5
2 7 6 4
6 4 7 8
8 9 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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