Printable Hard Sudoku

Set 1leofr2. 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 9 5 1 8 2
8 9 1 5
8 7
5 1 3 6
2 9 1
4 8
2 3 6
7 6 1 3
Hard #2
4 5 6
1 5
9 3 1
2 1 9 4 6
6 4 8 2 1 3
2 9
1 7 6 2
3 7 8
6
Hard #3
4 6 3 2
7 4 5
1 9
6 5 8
3 8 1 7
2 4 5
7 9
4 3 7 8
1 2 5 9
Hard #4
9 4 7 2 1
3
1
1 2 6 8
8 1 4
3 9 2
3 4 9
6 3 2 5 7
2 1 7 3
Hard #5
9 4 8
2 3 7
2 5 7 4
4 9 7 1
5 8 6
1 4
3 4 5 9 2 7
6
9 7 6
Hard #6
7 1 6
5 3 1 6 4
3 2 7
6 5 8
7
2 5 8 4
4 3 9
7 4 2 5 3
3 1
Hard #7
3 6 4
8 3 7
9 7 5 3
4 6 2 5
2 8 3 7
1 3 7 5 4
7 8 9
5 7
3
Hard #8
4 5 3 8 2 1 6
6 5
1 7
3 2 5
6 8 2 1 3
6 1 3 5
4 8 2
3 7 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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