you need to complete missions
you can play mini games make tasks watch videos rate article or to give your ref code and get 200 gems for every user how use your code and he get 500 sg . ;)
I am carrying out some big contracts... all i have to do is reach lvl 20 and 40 in these both games which is being hard... But i can slowly do it
u can get more through playing mini games, writing articles, completing tasks