Printable Hard Sudoku

Set 1cox4i3. 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
1 9
3 2 8 5 1
7 4 5 9
8 9
2 1 7 6 4
8 2 5 1
3
1 8 5
3 5 6
Hard #2
5 4 9
3 8 7
4 6 3 2 1
7 3 2
8 1
2 1 6 4
5 6
4 5 1 7
6 1 3
Hard #3
3 5 6 1
2 9 7 3
9 6 3
5 8 3
5 2
7 9
8 1 6 9 5
4 1
2 1 5 3
Hard #4
4 8 1 2
8 4 7 9 6
2 5
3 5 7 8
2 6 9
3 1
2 8
5 8 9
4 7 3 6
Hard #5
5 9 1 3
4 2 6
6 1 9
4 7 8 6 9
2 5
1 7 3 4
3 9
5 6
2 5 4 1
Hard #6
8 9 3
4 6 7
7 1 2 6
2 3 8 4
7 4 5
6 4
6 3 1 5
9 4 1 2
8 5
Hard #7
1 6
9 2 8 7 4
2 1 5
8 5
8 4 6 9 1
9 4 6
9 2 7 1
3 1
8 3 2
Hard #8
7 8 1 4 6
2 4
2 5 9
1 9 4 2 8
5 3 1
8 7
8
9 5 7 2
4 1 7 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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