Sudoku 18x18 num: 596 (Level: hard)
1
F
2
D
C
D
4
9
H
8
3
A
G
C
F
2
I
5
1
8
B
9
3
F
6
7
I
4
7
G
B
F
E
C
3
6
B
C
D
5
7
E
F
2
A
C
4
G
1
B
5
3
B
9
C
A
I
3
4
F
1
2
7
D
G
B
G
E
2
8
4
E
5
4
3
F
6
H
4
3
1
8
6
F
A
5
9
F
5
7
D
3
1
4
8
1
H
B
F
5
4
7
4
7
5
2
9
A
5
4
3
C
E
6
3H9B18A6GCEF42ID57
FGEAC6I2D54798BH13
7D4I52B8H193E6AGCF
C6ADEFH724I5B3G891
18BG93DF6EACI7H245
52IH47G389B1AFD6EC
93G6B12CFADEH587I4
EFD2AC857IH4G163B9
47H8I5613BG9DC2FAE
I583H4F91G6B2E7CDA
AC27DE345H8I69F1GB
B16FG97ECD2A8435HI
DE752A1I483HFBC96G
H4318ICB96FG7A5E2D
G9FC6B5AE27D3I148H
8I193HEGBFC65D4A72
6BCEFG4DA7521H9I38
2A547D9HI318CGEBF6
Sudoku 18x18
Sudoku 18x18 is a bold expansion of the classic puzzle, stretching the challenge across a grid of 18 rows and 18 columns. The board is organized into 18 regions of 3x6 cells, and, as always, each number must appear only once in every row, column, and region. Instead of the usual nine symbols, you'll work with the numbers 1 through 18, which makes the puzzle broader and more dynamic. The larger variety of digits creates more possibilities but also more patterns to discover, rewarding players who enjoy patience, observation, and logical deduction. It's not about racing to the end but about carefully building the solution piece by piece.
Every puzzle begins with a set of starting numbers scattered across the grid. These initial clues provide the foundation for your reasoning, helping you eliminate candidates and trace the flow of logic throughout the puzzle. There is always a single unique solution, reached without guessing, making every step meaningful. This 18x18 version is ideal for players who already feel comfortable with formats like 12x12 or 16x16 and are ready to explore something even more expansive. It offers a fresh mental workout that improves concentration, strengthens analytical skills, and builds persistence. Solving an 18x18 Sudoku is like assembling a giant mosaic-each correct placement contributes to the beauty of the completed board.