The following are known Action Replay Codes for LEGO Island 2: The Brickster’s Revenge 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
a2316df9
80aebfdd
b69b2266
84defe59

Always on Skateboard
eaa90841
b50bd7df

Have All Cards
b502186e
823d1754
dfa49823
081a078c
256c33f2
b3bd44ff
aecaa1ab
3149e80c
7290d5b1
71f0cdc4
7e022dd1
6fff458d
5ebe3ce1
112ef0fd
19dc6c04
dd5017fc
f4276d4e
139043bb
e7233bc0
4d77c98a
1bbbca47
ecf73b0d

Press AR Button: Slow
dbba3a89
4cb74b94