I figured out a trick on MyVegas mobile app to get more coins by playing two challenges. Some of the challenges are to get a certain amount of gold coins. This is for the bronze,silver and gold levels. While playing a challenge when you are just about ready to earn the coins, go back mystrip and select the challenge that is to reach the # of coins. Play a couple of rounds on that challenge, earn the gold coins and then go back to mystrip and go back to the original challenge. Hope that make sense.