Sudoku 20x20 num: 241 (Level: hard)
H
6
3
2
J
G
9
C
3
B
D
J
I
8
I
5
1
F
E
H
7
2
9
J
F
4
F
4
K
B
2
J
8
I
5
G
4
7
6
3
G
9
8
5
5
F
3
4
K
B
I
5
K
2
3
B
G
C
7
4
H
6
E
C
D
9
1
2
1
H
6
3
J
A
C
1
2
G
5
I
7
4
3
J
6
7
K
4
8
B
5
C
4
8
6
F
I
D
9
2
A
5
1
E
F
3
4
B
3
E
F
A
3
G
8
D
J
1
4
F
D
8
K
H
8
H
J
7
6
9
4
B
D
7
6
C
K
E
9
4
FEH643K72B8JIAG591CD
3K72BFEH64591CD8JIAG
8JIAG591CDFEH643K72B
591CD8JIAG3K72BFEH64
EF6H347KB2J8AI5G19DC
47KB2EF6H3G19DCJ8AI5
J8AI5G19DCEF6H347KB2
G19DCJ8AI547KB2EF6H3
H6FEK7438J2BG5IACD91
7438JH6FEKACD912BG5I
2BG5IACD91H6FEK7438J
ACD912BG5I7438JH6FEK
6HEF7K34J8B25GAIDC19
K34J86HEF7IDC19B25GA
B25GAIDC196HEF7K34J8
IDC19B25GAK34J86HEF7
9I24F1AB3ECG8KHD5J76
1AB3E9I24FD5J76CG8KH
CG8KHD5J769I24F1AB3E
D5J76CG8KH1AB3E9I24F
Sudoku 20x20
Sudoku 20x20 takes the traditional puzzle format and magnifies it into a truly impressive grid of 20 rows and 20 columns. The board is divided into rectangular regions of 4x5 cells, and the challenge is to place the numbers 1 through 20 so that none repeat in any row, column, or region. Working with a wider range of digits means you'll encounter more complex interactions and patterns, which demand a careful and methodical approach. Rather than focusing on speed, this format rewards patience, steady reasoning, and the ability to keep track of multiple possibilities at once. Solving it feels like navigating a large logical landscape, where every step brings you closer to order.
Each game begins with a selection of pre-filled numbers that serve as your starting framework. From these given values, you gradually uncover the solution by cross-checking rows and columns, testing relationships between regions, and ruling out conflicts. Every 20x20 Sudoku is designed to have a single unique solution, achieved through pure logic and observation. This larger format is ideal for players who want to explore puzzles beyond 12x12, 16x16, or even 18x18, and who enjoy the satisfaction of working on a board that feels expansive and ambitious. It strengthens memory, focus, and problem-solving skills while offering a deeply engaging experience. Completing a 20x20 Sudoku is both a mental workout and a rewarding achievement, transforming a grid full of possibilities into a perfectly balanced structure.