The gamble feature is a mini-game that has been enabled in slots since the early days. The gamble feature allows you to double your winnings if, for example, you are not satisfied with the payout, or you would like to take the risk for a bigger multiplier. It's up to you whether to use the gamble feature, but online casino regulars adore it. With the gamble feature, your odds are equally divided with the casino. No other game, even the most profitable ones, gives such an advantage to the player.