Printable Hard Sudoku

Set 98lsej. 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
7 2
1 5 2 8 7
6 5 4
3 5
3 1 4 9
8 1 4
2 3 5 8
9 4 6 7
2 9
Hard #2
7 8 9 5
3 5 7
1 3
8 1
6 4
1 3 2 6 4
9 2 6 7
2 8 5
8 7 2 3
Hard #3
8
4 2 9 1 6
6 5 1 7
2 9 5 4
7 3 9
9 8 3
4 6 2
8 4
9 7 6 3
Hard #4
5 8 7
7 8 3 4
9 6
4 7 3 2
5 6 4 9
3 1
4 3 9 2
3 5 1
1 2 8
Hard #5
9 4 5 8 1
6
1 7 5 8
1 2 3
7 6
7 3 8 5
9 3 2 8 6
4 7 3
5 4
Hard #6
4 7 9 5
3 2
2 6 1 4
9 2 6 7
6 3 9 2 5
8 4 7
7 3
1 3 5
8 2
Hard #7
5 8 2 1
4 8 2 3
6 1 4 7 3 5
9 6 3
4 1 7
9 6 3 2 8
5 6
3 4
Hard #8
4 2 8 7
7 3 2
5
7 1 5 9 3 6
3 6 1
1 5 9
5 9 8 7
1 5
4 3 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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