In some gaming machines, there is something called risk function. You get to the risk function after winning in the regular game. In the risk function or risk bonus feature as it is also known as, you can then play “double or nothing” on your profit. Usually this is done by guessing the color of next card drawn from a deck of cards. If you guess right, it double your profits, but if you guess wrong, you will lose your profit. If you win, you can continue and then be able to quadruple your profits, and so on. A fun and simple game that make slot machines a little more exciting.