Printable Hard Sudoku

Set aiseo4. 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
5 1 6
9 3 2 7 8
7 8 2
8 5 7
3
2 5 3
9 5 6 3 1
4 3
1 5 7 9
Hard #2
3 8 7
2 8 3 4 6
9 6 1
7 5
1 5 6
9 8 2 1
8 3 1 7
1 7 4 8
6
Hard #3
5 4 3
8 7 2 3
8 1
3 2 9 7 5
2 8
6 9 2
2 5 6 4 3
7 9
3 1 6
Hard #4
4 5 1 9
3 8 9 4
6 5 3
6 7 5 8
3 7 9
2 3 5
6 1
4 3 1 5
9 6
Hard #5
5 1 6 7
2 3 8 1
5 4
4 1 7 3 8
9 1 4
6 9
1 2 3 6
3 9 5
1 7
Hard #6
4 5 8
4 5 7 3
9 3 4 5
3 8
5 9 7
8 2 4
3 4 2 7 1 5
6 3
1 9
Hard #7
1 8 9 7
2 6
7 5
6 4 8 5
9 3 2
4 6 3
5 8 9 6
9 8 7 2 1 5
8
Hard #8
2 8 6
5 4 6 9
7 5 4
1 5 2 4
5 3
7 6 1
1 7 2 8 4
1 9
9 6 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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