Sudoku 20x20 num: 257 (Level: hard)
4
5
2
I
1
D
7
5
2
A
J
H
B
D
J
H
2
A
B
7
I
1
D
E
5
C
2
J
6
3
C
E
G
7
B
C
F
9
7
B
G
I
F
3
H
K
9
B
1
D
G
C
F
3
6
I
8
G
D
E
9
K
C
5
B
9
2
G
D
E
C
I
7
A
G
D
1
6
F
J
F
6
C
5
A
2
8
7
K
1
F
6
7
9
2
G
A
2
D
B
6
5
4
9
2
G
E
6
9
2
6
E
A
4
I
5
G
1
A
H
8
I
5
3
G
C
J
D
E
A
4
F
7
G
I
5
E
D
2
6
6F3JH45C2AI1DE8G9KB7
45C2A6F3JHG9KB7I1DE8
I1DE8G9KB76F3JH45C2A
G9KB7I1DE845C2A6F3JH
F6J34HC5A21IEDG8K97B
HC5A2F6J348K97B1IEDG
1IEDG8K97BF6J34HC5A2
8K97B1IEDGHC5A2F6J34
3J6F5CH4I12A8GDEB79K
CH4I13J6F5EB79K2A8GD
2A8GDEB79K3J6F5CH4I1
EB79K2A8GDCH4I13J6F5
J3F6C54H1IA2G8ED7BK9
54H1IJ3F6CD7BK9A2G8E
A2G8ED7BK9J3F6C54H1I
D7BK9A2G8E54H1IJ3F6C
9D2H6KEA4FB8I537G1CJ
KEA4F9D2H67G1CJB8I53
B8I537G1CJ9D2H6KEA4F
7G1CJB8I53KEA4F9D2H6
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.