Sudoku 20x20 num: 217 (Level: hard)
K
A
3
5
8
6
5
F
K
A
C
6
8
J
I
C
6
2
F
2
1
8
3
K
4
B
E
7
F
D
C
6
E
7
F
K
4
A
1
I
J
8
I
K
E
3
5
C
2
J
I
E
F
K
A
H
3
1
5
6
2
H
1
A
J
2
9
5
F
9
I
J
C
4
D
F
I
E
G
B
A
7
H
E
1
G
5
9
J
2
D
H
E
1
B
K
7
8
2
I
9
J
1
8
6
D
C
9
J
3
E
B
4
C
E
4
J
F
H
K
G
A
2
I
7
D
C
4
9
6
G
3
A
D
H
9
C
8
E
4
4KABEH375FG18J9ICD62
H375F4KABEICD62G18J9
G18J9ICD624KABEH375F
ICD62G18J9H375F4KABE
K4BAHE73F51GJ8I9DC26
E73F5K4BAH9DC261GJ8I
1GJ8I9DC26K4BAHE73F5
9DC261GJ8IE73F5K4BAH
AB4K37EHG15F9I8J62CD
7EHG1AB4K3J62CD5F9I8
5F9I8J62CDAB4K37EHG1
J62CD5F9I87EHG1AB4K3
BAK473HE1GF5I9J826DC
3HE1GBAK47826DCF5I9J
F5I9J826DCBAK473HE1G
826DCF5I9J3HE1GBAK47
C85E4DJFHK69G3A2I17B
DJFHKC85E42I17B69G3A
69G3A2I17BC85E4DJFHK
2I17B69G3ADJFHKC85E4
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.