Sudoku 20x20 num: 221 (Level: hard)
6
7
3
8
7
9
A
I
C
F
G
K
C
D
7
3
9
H
J
8
5
9
4
A
B
1
6
7
K
F
J
6
4
1
K
G
K
G
F
8
E
5
A
B
6
7
5
I
G
F
E
6
9
D
4
B
7
1
K
9
5
E
I
A
J
5
E
5
8
I
4
B
7
6
G
K
2
C
J
9
E
3
G
K
B
7
A
B
1
H
9
E
C
2
1
G
D
A
J
5
E
F
2
J
A
8
J
E
5
F
A
6
J
2
7
3
F
A
9
K
3
D
2
G
7
4
5
G
C
E
D
6
B
J
1
K
G
H
8
9
BA4D61739HGK8F5EIJ2C
1739HBA4D6EIJ2CGK8F5
GK8F5EIJ2CBA4D61739H
EIJ2CGK8F51739HBA4D6
ABD41637H9KGF8E5JIC2
637H9ABD415JIC2KGF8E
KGF8E5JIC2ABD41637H9
5JIC2KGF8E637H9ABD41
4DBA7361GK9H5E8F2CIJ
361GK4DBA7F2CIJ9H5E8
9H5E8F2CIJ4DBA7361GK
F2CIJ9H5E8361GK4DBA7
D4AB3716KGH9E5F8C2JI
716KGD4AB38C2JIH9E5F
H9E5F8C2JID4AB3716KG
8C2JIH9E5F716KGD4AB3
I896BJFH1A25G74CEK3D
JFH1AI896BCEK3D25G74
25G74CEK3DI896BJFH1A
CEK3D25G74JFH1AI896B
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.