Lowered your standard to 'receive coin rewards by playing these other games - progress levels to win more'. That's as low as it gets. Cue - 'thanks for your feedback blah blah, we do this to help people get coins without spending money'. P.S. fix your ratio of coin purchases and you would find a dramatic increase of purchases. I.e. $15 for 3m coins? How about $1.50 - much more happy purchasing customers and less scabby sales tactics.