Printable Hard Sudoku

Set 148yaa3. 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 2 3 9
4 3 7 1 8
2
3 8 9
8 9 7
1 6 7 4
7 9 8
3 1 4
8 9 5
Hard #2
6 4 5 8
2 8 3 7 5
1
3 8 6 9
9 2
8 9 3 6
7 2 1
5 9 7 1 8
3
Hard #3
3 6 4 8
7 1 2 6
2 9 1
4 7
6 3 9
1
1 4 7 8 5
3 6 9 8 4
2 4
Hard #4
2 8 7 4
1 6
1 8 9 6
5 3 4 7 1
1 3
8 3 2
4 8 3 5
7 2
8 4 7
Hard #5
2 8
7 6
6 9 3 4
6 5 9 8 2
8 3 1
7 6 9 3
8 3 5
5 6
1 3 6 8
Hard #6
1 8 7
5 7 6
3 2 5 9 8
5 9 1
1 5 2
2 9 8
1 7
7 4 6 9
4 3 5
Hard #7
7 2 6 1
1 5 8
5 3 1 2 6
3 8 1 2
5 4 3
2 5 8 1
5 7 9
3 5
1
Hard #8
4 5
2 3 1
3 7
4 8 1 7 9
4 5 6
6 9
2 5 7 4
1 7 9 6
8 3 6 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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