First of all, you have to decide how much you want to wager. Let's say you wager 1 coin. Now you wait for the game to start. When the game starts, a multiplier will be shown that keeps going up. You need to press "cash-out" before the game crashes. If you don't cash out in time, you lose your 1 coin bet. On the other hand, if you manage to cash out before the game crashes, your coin will be multiplied by the number you cashed out at.