Gamble feature is one of the oldest slot machine features. This feature was already on many land-based slot games. You can still see the feature on online slots.
The gamble feature is also known as the Risiko Game, Double Up, Head or Mint, Head or Tails, etc. The name may differ per game provider, but the idea is the same every time. You win something in a spin, bet it through the gamble feature and with some luck you double your bet. You double up by predicting correctly which side the coin falls on or by predicting correctly which colour card the next playing card has. You will have a 50% chance of winning.
Nowadays there are some variants, such as betting on higher or lower, betting on the correct symbol of the card and gamble features with variable odds and prizes.
Heads or Tails
You know, heads or tails is a game where you flip a coin, choose which side you think it will show when it lands. You bet by pressing the button with heads or the tails with coin or just hit it hard if you thought it affected your chances of winning. Then the luminous cursor shot up super fast and more between head and coin to stop at one of the two.
There are two possible outcomes. The chance of a head is exactly the same as the chance of a tail. So you have a 50% chance of winning.
Red or Black
Another variant is that you bet on the correct colour of a card. After a winning spin, choose again whether you want to play the gamble feature or not. When you play, you bet on red or black. Then a card is turned over. Does that card have the color you bet on? Then you double your winnings.
Why Is the Gamble Feature on Slot Games?
That is a very good question. In many cases it doesn’t seem to matter much whether you play the gamble feature or not. The main reason is to give the player the impression that it is affecting the game. People, especially gamblers, sometimes tend to overestimate themselves. Just like with roulette, many slots players believe they see patterns in the outcome of the gamble feature on a slot game.