Free printable · Answer key included
Printable Hard Sudoku
Hard Sudoku for confident solvers: the fewest givens we print, and grids that reward careful candidate tracking.
This first pack has six Sudoku puzzles with an answer key on the second page. Each grid has 28 given numbers.
Hard Sudoku
logicpuzzles.ca/printable/sudoku/hard
Puzzle 1 · #241
4
9
1
7
4
2
5
6
9
8
4
1
6
6
5
9
7
1
4
3
4
6
3
6
2
7
9
1
Puzzle 2 · #294
5
1
6
3
7
2
8
5
3
8
3
5
4
1
8
6
2
9
7
6
1
9
7
4
1
8
2
9
Puzzle 3 · #295
8
1
5
2
4
2
5
7
3
9
4
6
3
8
6
1
2
9
4
8
6
7
3
5
1
8
1
9
Puzzle 4 · #276
6
3
1
6
2
6
2
1
8
9
7
4
2
1
7
3
5
6
5
1
3
5
2
2
4
9
7
4
Puzzle 5 · #242
8
5
1
9
7
4
1
1
5
8
2
3
7
9
8
6
3
4
5
2
6
9
1
4
5
6
2
8
Puzzle 6 · #225
4
5
3
6
7
4
2
8
9
8
6
1
2
9
7
3
8
2
5
4
3
7
1
8
7
3
5
4
Answers: Hard Sudoku
logicpuzzles.ca/printable/sudoku/hard
Puzzle 1
8
7
4
3
9
5
6
1
2
9
6
3
1
2
8
7
5
4
2
5
1
6
7
4
8
3
9
4
2
9
7
6
3
1
8
5
7
8
5
2
4
1
3
9
6
3
1
6
8
5
9
4
2
7
1
9
7
4
3
2
5
6
8
5
4
8
9
1
6
2
7
3
6
3
2
5
8
7
9
4
1
Puzzle 2
9
3
4
7
2
8
1
5
6
5
1
6
3
9
4
7
2
8
2
7
8
5
6
1
9
3
4
1
9
7
8
3
6
5
4
2
3
4
2
9
7
5
6
8
1
8
6
5
4
1
2
3
9
7
7
2
9
6
4
3
8
1
5
6
8
1
2
5
9
4
7
3
4
5
3
1
8
7
2
6
9
Puzzle 3
3
8
9
1
6
5
4
2
7
1
6
4
8
2
7
3
9
5
5
2
7
3
9
4
8
6
1
9
4
6
2
1
3
5
7
8
7
3
5
9
4
8
2
1
6
8
1
2
5
7
6
9
3
4
2
9
8
6
5
1
7
4
3
4
5
1
7
3
9
6
8
2
6
7
3
4
8
2
1
5
9
Puzzle 4
4
9
8
2
5
3
1
7
6
3
1
5
4
6
7
2
8
9
6
7
2
1
8
9
4
5
3
8
5
7
3
9
1
6
4
2
1
2
4
6
7
8
3
9
5
9
6
3
5
2
4
7
1
8
7
8
1
9
3
6
5
2
4
2
4
6
8
1
5
9
3
7
5
3
9
7
4
2
8
6
1
Puzzle 5
8
4
2
7
5
1
6
3
9
5
9
7
6
8
3
4
1
2
3
6
1
4
9
2
5
7
8
6
8
5
2
3
4
7
9
1
2
7
9
8
1
6
3
5
4
1
3
4
9
7
5
8
2
6
9
1
6
3
4
7
2
8
5
4
5
3
1
2
8
9
6
7
7
2
8
5
6
9
1
4
3
Puzzle 6
7
4
8
9
1
5
2
3
6
5
6
3
7
4
2
8
9
1
9
2
1
8
6
3
4
7
5
4
5
9
6
7
8
1
2
3
1
8
2
3
9
4
5
6
7
6
3
7
2
5
1
9
8
4
2
9
5
4
3
7
6
1
8
8
7
4
1
2
6
3
5
9
3
1
6
5
8
9
7
4
2
How to solve
- Rows: Each row holds the numbers 1 to 9 exactly once.
- Columns: Each column holds the numbers 1 to 9 exactly once.
- Boxes: Each 3x3 box holds the numbers 1 to 9 exactly once.
- Pencil marks: Write small candidates in the corners of a square, and rub them out as the grid fills.
Free to print and copy for home, classroom and library use. Every puzzle has one answer you can reach by logic alone.