Printable Hard Sudoku

Set iju3do. 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
3 4
5 3 6 7
9
8 2
2 9 8 7
7 8 5 3 4
3 8 7 1
4 9 3
1 6 4 5
Hard #2
7 3 6 1
2 4 9
2 1 5
2 8 5 9
9 1 2 5 3
5 4
6 5
5 7 4
6 3 9
Hard #3
5 3 8
6 8 3
1 5 2 9
6 3 4 5
8 4 6 1
3 1 6
4
7 1 3
9 2 8 6
Hard #4
6 5
7 9 2 6
3 5 4 9
5 6 7
9 6
3 1
4 8 7
8 3 6 5
5 6 9 4 8
Hard #5
7 6
6 4 1 7 9
5 9 4 6
1 3 5 4
9 8 7
1 9 2
6
7 5 4 9
3 2 1
Hard #6
7 9
3 8
9 5 8
6 3
5 1 2 4 8 6
9 6 2 5
9 8 3 4 2
6
4 1 5 8
Hard #7
2 9 7 4 6
4 2
5 8 7 9
7 3
4 8 1
9 8 3 6
1 3 2 5 7
7 8
1 9
Hard #8
1 3 7
4 9 7 6
2 4
2 3 1 8
7
8 5 9 3 2 4
9 5 1
6
1 2 4 8 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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