Facade of the Benjamin Club
The Benjamin Club is a casino, just like Gambleville or Casino, but has a rough difference: to enter you must have the Benjamins Club Card. You can buy it from the Benjamin Club Liaison, at the Dangling Pianist for $50,000 ($25,000 with "Discount shopper" cheat)
While in the slot machines in Gambleville you bet $1 to $20, $5 to $100 in the Casino, you bet $1,000 to $20,000 at the Benjamin Club.
There are many places to gamble in this club, but one has a great prize: The Castle Quest. Once completed, it rewards the Castle Key, a key to the prize: the Castle playerhouse.