If you look up what is a progressive slot machine online, you’ll see that there are two ways progressive jackpot games build prizes. For standalone progressive jackpot games, a part of every bet played on progressive jackpot slots go towards the jackpot. If a game is a networked game, such as Mega Moolah, all machines on the network contribute to a progressive jackpot. Progressive jackpot winners can come from any machine on that network.