Printable Hard Sudoku

Set 61yba4. 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 4
5 8 1 2
5 6
9 4 7 6
4 3 7 2 1
6 5 2 4
8 9 6 7
4
1 5 9
Hard #2
8 5 1
5 6 8
3 1 6 5
4 6 2
5 9
3 2 4 8
6 5 2 3
7 8 9 1 4
9
Hard #3
3 2 6
5 1 7
3 4 1
3 9
5 2 3 7
7 4 6 5 2
9 5 4 1
3 9
2 1 6
Hard #4
8 3 7
4 7 5
1 3
6 7 9 4
9 5 4 6
4 2 7 3
1 7 2 8
5 1
6 5 9
Hard #5
6 4 9
9 4 1
7 3 5 1
4 2 9 3
5 7 2
9 1 5
1 2 8 7
7 4 6
8 6
Hard #6
6 3 8 1
1 5 3 9
9
5 6 3
4 2
7 6 5
3 1 8 7 2
7 3
9 5 6 7 3
Hard #7
8 6 7 3
2 5 9 6
9 2 5
7 4 6
5 9
1 4 8 9
1 9 6 8 2
2
2 1 3
Hard #8
5 6 4 1
8 5 6 9
4 7 6 3
3
5 8 3 6
4 6 5
9 3
8 5
5 9 2 8 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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