Progressive slot machines offer a jackpot as a large payout, which increases every time someone plays the game, but no one wins the jackpot in the meantime. When someone still wins, the jackpot is reset to the preset value in the next game, which depends on the game. Then, it starts to increase again on the same principle. The jackpot or jackpot money is “rolled over” to the jackpot for the next drawing after each drawing in which the jackpot is not drawn.