Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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