Sudoku 18x18 num: 518 (Level: hard)
1
7
2
6
8
4
A
8
5
B
9
7
D
B
3
2
7
5
4
C
B
9
A
G
I
D
5
6
7
D
8
C
B
4
F
I
3
3
A
1
6
5
C
B
F
8
H
F
B
9
D
I
5
E
7
5
8
9
D
3
2
D
E
F
4
3
5
B
H
F
A
4
9
G
1
7
8
E
5
7
9
I
D
2
D
E
H
F
G
I
2
E
C
6
4
H
A
2
2
1
F
H
9
H
I
7
E
D
1
C
4
I
3
E
1DE726CF5H84B3G9AI
8CF45HAIB39G2671DE
9AIGB3DE26175H48CF
48HFCB93A2GID5E716
716ED58HCB4FA2IG93
G93IA216D57ECBF48H
F4BH8AG29DI31C6E75
E7561C4B8AFH9D3IG2
IG239D751CE68AHF4B
3ID2G1EC786549BHFA
HFAB49IDG1327856EC
6EC578FA49HBG123ID
231DI768E45CFGABH9
BH9AFG31I72DE4C568
568CE4H9FGBAI7D231
D2713E546FC8HI9ABG
ABG9HI273ED16F8C54
C5486FBGHIA93E1D27
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.