Rip the Computer Off For Good Property:
You can rip the computer off by trading 1 more credit then he payed
for the property. For an example if he payed 300 credits for the
imperial palace then you could trade him 301 dollars for the imperial
palace and he would accept the trade.
Win Every Auction:
Play at the hard level with 2 computer players and one human player.
You should be the human player. If you add credits to the amounts you
offer in 1 small amount of credits When the computer says he will pay
a small amount of credits let him have the property. Then use the rip
the computer off code. That way you can have the imperial palace
for 11 credits