The following are known Action Replay Codes for Yu-Gi-Oh! Worldwide Edition: Stairway to the Destined Duel on Nintendo Game Boy Advance (GBA).
These codes were also known as GameShark Codes and in most cases will work on both devices.

These codes are for the U.S. version of the game.

Master Code – Must Be On
1a0a5ed8
af5d5b0d
d98c7bc9
b0bc4f0b

Instant Win
aabb3fd8
908caa85

Infinite Life Points
8b477f98
70666d1e

Have All Cards
46652fff
47114191
a870fe43
61f00a2b
312073db
6b036250
a870fe43
61f00a2b
3cd5df7e
bc21f0c0
a870fe43
61f00a2b
39485299
0abc57e6
a870fe43
61f00a2b
b6ed7e3d
ea75f66d
bcb6bdf9
1d21b99f