You can change the value of the coin from a minimum of 0.01 to 1.00, and you can bet up to 10 coins per line. All coins and lines must be of the same value.
If you want to take more risks, if you win, you can challenge the emperor to participate in the gambling war. Instead of collecting your money, gambling it has a chance to win a higher bonus. You will get a playing card, all you have to do is get the prize and correctly predict whether the next card is high or low.