Secondary game system, a gaming system and a method of providing at least one secondary game in a gaming system

A jackpot game system for a gaming terminal network, including:

• at least one jackpot game controller for providing a plurality of jackpot games;
• and
• a communications device for receiving jackpot game registration request messages and jackpot game deregistration request messages from a gaming terminal, said jackpot game registration request messages being sent in response to operation of a user-operable registration input device for allowing a user of the gaming terminal to indicate a desire to register in at least one of said plurality of jackpot games;
• the system being responsive to a received jackpot game registration request message from the gaming terminal by causing said gaming terminal to be registered in at least one of said plurality of jackpot games such that a proportion of gaming activity on a primary game of the gaming terminal is contributed to the registered at least one jackpot game;
• and
• the system being further responsive to a received jackpot game deregistration request message from the gaming terminal by causing said gaming terminal to be deregistered from one of said plurality of jackpot games such that substantially none of the gaming activity of the primary game is contributed to the at least one unregistered jackpot game.