Sudoku 20x20 num: 237 (Level: hard)
7
B
J
C
D
A
F
8
I
G
4
9
B
C
2
K
I
9
E
A
F
E
I
9
5
H
D
7
3
J
5
C
E
8
D
B
8
G
A
F
6
A
F
8
I
9
4
B
K
D
8
G
I
9
4
K
5
1
3
5
H
D
G
J
B
1
2
3
G
8
6
D
9
2
J
K
B
A
E
I
C
D
J
1
3
5
2
1
A
D
C
8
9
I
5
A
H
1
6
E
F
4
3
J
5
B
4
G
I
6
8
7
F
E
5
9
6
A
E
D
3
I
F
C
K
7
H
8
H
1
J
2
I
3
9
6
H
G
E
D
7312KB5JCDHAFE86IG49
B5JCD7312K6IG49HAFE8
HAFE86IG497312KB5JCD
6IG49HAFE8B5JCD7312K
3721BKJ5DCAHEF68GI94
KJ5DC3721B8GI94AHEF6
AHEF68GI943721BKJ5DC
8GI94AHEF6KJ5DC3721B
12735JKBHACD86FE49IG
JKBHA12735E49IGCD86F
CD86FE49IG12735JKBHA
E49IGCD86FJKBHA12735
2137J5BKAHDC68EF94GI
5BKAH2137JF94GIDC68E
DC68EF94GI2137J5BKAH
F94GIDC68E5BKAH2137J
IFCK7GEDB348H5196AJ2
GEDB3IFCK796AJ248H51
48H5196AJ2IFCK7GEDB3
96AJ248H51GEDB3IFCK7
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.