Sudoku 20x20 num: 204 (Level: hard)
2
A
7
6
J
1
B
9
6
3
H
4
9
J
4
1
B
3
H
C
8
5
G
F
7
C
A
H
3
2
8
J
I
4
1
5
E
D
H
A
7
1
J
K
I
4
1
9
B
A
G
C
8
H
2
3
E
7
K
6
9
5
1
D
7
K
2
B
9
F
4
F
I
1
A
3
J
6
I
E
7
2
K
J
8
F
B
7
3
9
8
4
F
G
6
4
G
B
5
H
C
7
5
G
2
D
8
3
7
H
C
2
1
5
8
E
9
4
B
F
2
B
J
C
2
K
A
5
8
E
3
1
G
6
4
K
J
1
5
8
3H2AE7CD86JKIGF451B9
7CD863H2AE451B9JKIGF
JKIGF451B93H2AE7CD86
451B9JKIGF7CD863H2AE
H3A27EDC68KJGI4F159B
EDC68H3A27F159BKJGI4
KJGI4F159BH3A27EDC68
F159BKJGI4EDC68H3A27
2A3HCDE7JK86F4IGB951
DE7JK2A3HCGB95186F4I
86F4IGB9512A3HCDE7JK
GB95186F4IDE7JK2A3HC
A2H3DC7EKJ684FGI9B15
C7EKJA2H3DI9B15684FG
684FGI9B15A2H3DC7EKJ
I9B15684FGC7EKJA2H3D
5I8E31G67HBFJC294KDA
1G67H5I8E394KDABFJC2
BFJC294KDA5I8E31G67H
94KDABFJC21G67H5I8E3
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.