Printable Hard Sudoku

Set 1e3mthi. 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 2
4 8
1 9 2 5 4
5 9 8
2 7 3 8 1
8 4 7 3
1 9 8
6 4 3 2 9
Hard #2
5
5 1 8 7 6
6 1 9 5
5 7 6
3 7 8
9 1 7
7 3 1 4 2
3 2
1 9 3
Hard #3
8 1 2 3 7
2 5 6
4 1 9
5 7 8
3 7 2 5
9 3
6 1 8 9
3 6
9 3 4
Hard #4
6 3 8
5 8 3
7
1 6 3
5 4 2 1
6 1 8
2 8 9
9 7 5 3 8
3 8 9 2
Hard #5
8 5 7
4 8 9
2 9 7
5 3 2 6 8
9 6 5 2
9 1
9 3 7
7 8 2
3 1 4
Hard #6
2 8 9
5 3 2
7 8
8 6 4 5
5 9 2
3 4
1 6 7 3 5 8
7 5 1
3 8 6
Hard #7
6 9 7 3 2 5
3 4 5 1
4 9 3
5 7
1 8
3 8 9
9 6 4 3 1
8 4
7 6
Hard #8
8 9 2
9 4
1 3 5 8
3 2 5
7 6 4 9
4
6 4 9 1 3
9 8 7
7 1 9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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