Caesar's Palace Advanced - Millennium Edition - Platform: Gameboy Advance

Start with $5,900:
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Enter q#cbv#dbbbxbM as a password. 

Start with $16,305:
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Enter W9fbv#dbbbxbB as a password. 

Easy money:
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Go to the "Table Games" menu, then to "Roulette". Change the 
value of your bet to a negative number by adding the value of 
your bet to over $32,000. Then, place your bet on the table as 
many times as desired to get as much money as you can. If you 
win you do not lose money, you win twice as much. Note: Go easy
if your money totals more than $1,000,000 you will get a message 
stating that you are a millionaire and restart.