The following are known Action Replay Codes for Caesars Palace Advance: Millenium Gold Edition 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
Master Code – Must Be On
a001d69e
cc1b24d2
ed4ad2e8
825b50eb

Infinite Cash
3c1b5149
f8215a3e

Press AR Button: Slow
dbba3a89
4cb74b94