the received control signal to modify the split of rtp between the first and second games the modification is arranged to reduce any divergence between the artp and the rtp the operation of the split controller 200 will be described in further detail below the second game controller 207 responds to the signals from the first game controller by adding the indicated rtp split value to the accumulator 209 and updates the display 109 fig1 with the revised jackpot value the second game controller 207 is the element of the jackpot controller 105 that runs the second game in other words the game controller 207 sets the non disclosed threshold value at which the jackpot will be paid out receives signals form the gaming machines and updates the accumulator 209 and the display 109 with that value the game controller 207 initiates a prize payout when a received rtp split value added to the accumulator 209 causes the jackpot to meet or exceed the payout threshold when this occurs the game controller 207 identifies which of the gaming machines 103 triggered the jackpot and sends a signal to the identified machine the gaming controller 201 of the identified gaming machine 103 responds to this signal by indicating to the user that the jackpot has been awarded and paying out the jackpot amount in response to a jackpot award occurring the game controller 207.