A gaming system including a central server linked to a plurality of gaming machines. The central server monitors wagers on the gaming machines. Based at least in part on the wagers the central server determines when bonus events will occur and which gaming machine(s) will provide the bonus awards. In one embodiment, the central server determines which gaming machine(s) will provide progressive awards and/or supplemental bonus awards, wherein the number of provided supplemental awards is determined based on the number of active gaming machines. Each supplemental bonus award provided by each gaming device is based on any accumulated wagers placed at that gaming device.