A method of operating a plurality of networked gaming machines in which each of the plurality of networked gaming machines is configured to enable a same or a different primary game to be played, may include steps of (randomly, for example) selecting a gaming machine of the plurality of gaming machines; activating a secondary game on the selected gaming machine for a limited period of time and generating a player-perceptible indication that the secondary game is active on the selected gaming machine. When the limited period of time has elapsed, a step of de-activating the secondary game on the selected gaming machine may be carried out, whereupon the method may revert to the selecting step. The secondary game appears to the players on the casino floor as a roving and unpredictable opportunity to win additional prizes or bonus, or to be able to enter large outcome games, with animations, sounds and/or other enticing effects running from one gaming machine to another. Players may attempt to "follow" the secondary game as it "moves" or "jumps" from one gaming machine to another, thereby further animating the casino floor.