Printable Hard Sudoku

Set rl6jdt. 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
1 8 6 4 5 2
1 6 4
9 7 5
3 1 7 9
5 8 3
2 4
8 6 2 4
5 2 7
Hard #2
1 6 9 5 7
5 8 7 2
4 2 3 8
6 8 4 9
3
7 1 9
8 5 3 2 6
6 2
5
Hard #3
3 4
6 2 1
7 4 3 6 9
2 8 4 5
1 4
5 2 1
8 2 4 1 9
6 7 8 1
7
Hard #4
7 6 2
8 7 1 9
9 4 3 5 7
4 6
7 9 6 3 5
5
2 3
4 8
8 7 6 9 2
Hard #5
2 3 4 6 9 5
1 5 8
7 2
3 6 7 5
7
5 2 4
9 1 3
6 4 1
6 4 9 5
Hard #6
9 5 7 4
1
6 1 3
7 9 8 1 5 4
1
4 5 8
9 1
3 4 6 2
8 7 3 4 9
Hard #7
2 3 8 1 6 7
7 5
6 7 3 5
3
1 9 2 5
5 4
6 2 7 9
4 1 9
7 2 3
Hard #8
7 5 8 3 6
8 7 4
9 6 5 8
9 3 2
2 6 4 5 3
8
3 7
2 9 5
4 7 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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