hello,ive a few mines running..but after i gone to bed and woke up in the morning,no coins were mined.am i doing something wrong?
Did you check the efficiency level of your buildings? If you don't refresh it, that efficiency will slowly drop (2% per hour) and I am afraid that a zero level will prevent you to receive any coin.
You can recover that efficiency 5% per hour by refreshing your activity plus an additional 5% by watching videos