By selecting the double button, you can double your earnings whenever they are equal to or less than 1,750. Next, pick the red or black suit from a deck of cards. If your prediction is accurate, your win is doubled; if incorrect, you forfeit the earnings you bet.
You may wager four times, provided you win each time. Simply disregard the double button if you want to avoid risk. You can leave the feature by selecting “take” if you bet well but did not use all four chances.