Printable Hard Sudoku

Set 15l4za2. 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 3
3 9 5
2 5 9 4
8 6 9 7
2 9 6 8
6 1
1 5 3 6
5 1
9 7 4 2
Hard #2
5 3 2
7 9 8 5
4 2 7
6
1 5 4
7 3 4 2 6
3 4
8 6 5 7
4 9 8 2
Hard #3
1 8
7 9 8 2 5 3
5 8 3
2 4 3
2 4 7
3 5 1 2
9 6 4 5
2 7 3 8
Hard #4
5 2 8 1
8 9 6 4 7 5
9
4 7 5
1 3 5 4 8
7 3
8 7
6 9 3
9 1 2
Hard #5
6 3 1
7 5 6
5 8 3
9 3 8 6 1 4
4 8
3 9 2
2 4 9 6 5
4
6 7 3
Hard #6
5 8
1 4 9 3 7
3 8 2 1
3 8
4 5 9
9 7 2 4
1 6 9 5
3 6 5
4 2
Hard #7
9 3 5 6
2 7 9
7 4 6 1
7 6 3
6 9 5
4 9 7
2 5 7 8
3 8 4
2 3
Hard #8
3 1 5 4
5 8 7 1
4 5 2
2 1
8 1 4 6
4 9 3 5
6 8
2 3 4 7
9 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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