Printable Hard Sudoku

Set 1o4oun4. 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
7 3 9
4 9 1 6
5 1 7
4 2
5 7
2 3 4 5 8
8 7 4 2 9
3 1 6
6 3
Hard #2
5 4 3
7 1 9
4 2 5
4 2 9 1
7 9 8 2
3 4 7
5 1 2 9
2 9 6 7
6
Hard #3
1 4 7 5
6 2 7
3
1 7 5 4
3 8 1
5 9 6
3 7 4
4 8 9
7 5 4 8 3
Hard #4
2 8 4 1
2 3 9
9 5
4 3 7 5
3 8 5 4 2
6 2
8
4 5 1 3
3 6 2 5
Hard #5
9 7 6
9 3 8
7 5 9 4
8 5 3
4 2 9
7 6 4 8
1
2 9 3
2 6 4 3 5
Hard #6
8
1 9 8 3 4
7 5 9
5 2 1 3
9 7
3 1 9
5 6 8
9 2 4 1 6
6 1 5
Hard #7
9 6 4
1 6 5 8
8 9
6 5 2
2 4 6 7
8 3 9 2
3 1 5
6 4 3
1 5 7
Hard #8
6 2 7
4 5 9
3 5 2 1
1 9 2
6 4 3
7 1 3 5
3 9 4 5 7
2 8 3
4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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