Sudoku 20x20 num: 259 (Level: hard)
6
2
G
D
8
I
A
B
2
J
1
F
8
H
7
I
B
5
C
D
4
6
8
H
8
E
9
C
G
J
B
C
C
I
J
F
7
9
3
A
F
C
9
8
7
H
D
9
5
4
6
J
C
F
1
E
2
K
C
F
G
1
7
8
3
F
A
1
6
J
G
3
7
K
8
7
E
5
6
4
J
G
B
F
1
A
D
E
G
B
F
4
J
4
I
G
3
5
F
A
6
E
2
H
A
4
9
6
5
B
I
K
C
E
4
9
8
B
I
2
5
D
7
7
2
K
G
9
C
H
B
I
J
5
7
H
A
G
9
8
8H7K9ED34652GCJIA1FB
ED3468H7K9IA1FB52GCJ
52GCJIA1FB8H7K9ED346
IA1FB52GCJED3468H7K9
H8K7E93D6425CGIJ1ABF
93D64H8K7EJ1ABF25CGI
25CGIJ1ABFH8K7E93D64
J1ABF25CGI93D64H8K7E
7K8HD39E5246JIGCFBA1
39E527K8HDCFBA146JIG
46JIGCFBA17K8HD39E52
CFBA146JIG39E527K8HD
K7H83DE92564IJCGBF1A
DE925K7H83GBF1A64IJC
64IJCGBF1AK7H83DE925
GBF1A64IJCDE925K7H83
AG4981C6EHFJ5D7BI23K
1C6EHAG498BI23KFJ5D7
FJ5D7BI23KAG4981C6EH
BI23KFJ5D71C6EHAG498
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.