One kind of slot machine that is connected to other machines or online platforms is called a progressive slot machine. Each wager adds to thegameexchange 567 expanding jackpot pool, which has the potential to yield enormous payouts of up to millions of dollars. This can be seen in well-known games like Mega Moolah and Major Millions, where the jackpot keeps increasing until a fortunate player wins. Progressive Jackpot Unpredictability.