What does Gamble Feature mean in slots?

In slots, Gamble Feature is an extra function where the player can risk a win they have already received for a chance to increase it.

How does it work?

After a winning spin, the slot may offer a separate mini-round. Usually, the player has to guess a card, a color, a suit, or another simple outcome with an instant result. If the choice is correct, the win increases. If not, the amount is lost. That is why a Gamble Feature may look like a convenient way to boost a payout, but in practice it is simply an extra layer of risk on top of an already won amount.