Sudoku 20x20 num: 225 (Level: hard)
1
9
2
J
C
7
6
A
5
G
I
6
K
4
I
9
E
F
C
7
3
H
K
D
C
1
9
E
B
1
2
J
8
6
H
G
A
8
B
1
E
9
I
4
4
6
G
5
9
F
C
8
D
3
G
7
9
1
B
F
6
4
G
H
5
A
2
9
1
B
J
5
7
D
8
7
K
A
9
E
B
4
K
A
7
D
G
H
2
9
B
C
G
K
I
J
9
1
H
I
5
3
A
D
7
8
K
6
H
5
4
E
F
5
6
9
I
4
E
K
D
6
9
6
E
H
1
K
B
I
G
4
5
9
K
B
A
8
F
1
1B9EF2JC8764HKDGA35I
2JC871B9EFGA35I64HKD
64HKDGA35I1B9EF2JC87
GA35I64HKD2JC871B9EF
B1E92FCJ7846KHGD3AI5
FCJ78B1E92D3AI546KHG
46KHGD3AI5B1E92FCJ78
D3AI546KHGFCJ78B1E92
9E1BJCF26487DGHK5IA3
CF2649E1BJK5IA387DGH
87DGHK5IA39E1BJCF264
K5IA387DGHCF2649E1BJ
E9B1CJ2F4678GDKHI53A
J2F46E9B1CHI53A78GDK
78GDKHI53AE9B1CJ2F46
HI53A78GDKJ2F46E9B1C
AH8F13K72B5D6J9IG4CE
3K72BAH8F1IG4CE5D6J9
5D6J9IG4CEAH8F13K72B
IG4CE5D6J93K72BAH8F1
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.