Printable Hard Sudoku

Set 1pr98km. 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
6 3 4 8
3 4 9 8 6
1 7
5 6
4 2
2 6 8 1 5 3
4 5 3 9
8 5 2
Hard #2
1 5
4 3 9
9 4 1
5 8 4 7
3
1 8 3
8 7 5 6
2 4 3 7
1 5 6 9 4
Hard #3
9 2 8 7
5 4 9
9
9 4 2 8 6
1
3 7 6 4
1 5 7
5 1 4 8
3 4 9 5
Hard #4
8 1 9 3
8 4
7 6 5 2
6 5
9 8 4
8 3 4
3 7 9 6
5 7 3 1
5 1 2
Hard #5
7 8 9 2 4
5
9 2 4 6
8 4
3 1 9 8 2
9 8 5 6 3
3 7 1
1 8 6
5
Hard #6
4 3 8
5 9 1
7 8 3 4 6
9 6
1 2 3
7 6 9 8
3 6 7 4 1
5 4
2 7
Hard #7
1 4 3 6 7
2 7 5 8
1 8
1 5 2
9 1 7
3 4
4 3 8
2 4 5
8 2 4 9
Hard #8
7 3 1 2 4
6 2 5 1
9 2
8 6 1 3 5
1 9 3
7 4
5 2 8 6
6 7 9
1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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