Printable Hard Sudoku

Set 4g15tm. 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 1 8 7
5 9
6 2 1
4 5 1 6
3 2 9 4 7 8
5 7
6 8 4
3 9 2
6 7
Hard #2
2 5 1 7 3
4 6 9
5 3 2
6
2 5 4
2 9 1 7 6 8
4
6 9 4 1 7
8 6
Hard #3
3
5 6 4 8
1 3 4 7
5 6 9 1 8
4 3 6
6 9
8 9 1 7 3
7 9 5
5 1
Hard #4
9 4 1 2
8 6 2 9 3
6
3 2 5
5 1 2
1 9 3 8
7 9 4
3 1
2 8 7 5
Hard #5
3 5 9
4 5 8 2
2 8 5 3
6 5 1
3 5 1
7 5
2 7 8
9 4
1 4 7 9 6
Hard #6
1 9 6 4
9 5 6 8
5 6 9
7 2 1 8
2
6 9 8 1
3
2 5 6 4 9
8 9 6
Hard #7
8
4 5 1
2 1 3
2 6 3
9 5 7
9 4 2 6
3 9 8 5 4
2 1
1 8 7 5 9
Hard #8
8 2 1 5
2 4
7 6 2 4 9
3 9 1
6 9 3
8 7
4 5 3
1 3 2 8
8 6 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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