Sudoku 20x20 num: 300 (Level: hard)
J
E
C
F
4
E
8
8
K
2
A
J
5
G
7
H
B
K
D
1
4
4
G
K
2
F
3
B
E
C
D
1
5
F
B
2
I
1
J
5
7
H
D
8
2
6
D
1
5
4
G
4
7
D
A
7
4
5
C
9
3
D
I
A
J
C
G
K
2
F
H
I
7
E
G
8
J
C
5
J
7
C
I
6
G
K
4
6
F
D
I
2
H
D
J
7
K
9
B
3
D
2
G
E
8
H
B
8
C
4
9
7
5
H
6
E
9
A
5
8
4
8
C
9
3
J
F
G
9
A
K
7
I
C
4
2
3
D
E
J
J145EGC7DH8K62IA3FB9
GC7DHJ145EA3FB98K62I
8K62IA3FB9J145EGC7DH
A3FB98K62IGC7DHJ145E
1J54GE7CHDK826AIF39B
E7CHD1J54GIF39BK826A
K826AIF39B1J54GE7CHD
IF39BK826AE7CHD1J54G
45J1C7EG8KDHIA62B93F
7EG8K45J1C2B93FDHIA6
DHIA62B93F45J1C7EG8K
2B93FDHIA67EG8K45J1C
541J7CGEK8HDAI269BF3
CGEK8541J769BF3HDAI2
HDAI269BF3541J7CGEK8
69BF3HDAI2CGEK8541J7
36DEJF2HG1BI8C49AK75
F2HG136DEJ9AK75BI8C4
BI8C49AK7536DEJF2HG1
9AK75BI8C4F2HG136DEJ
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.