im not joking u should try this, i just invest 30$ in ETH and in one hour i duplicate my money..
heres the link:
https://www.cryptokitties.co/
how it works:
buy 2 cats, (try the first gens, they breed more faster) breed them and u have another one. u can sell it or make another breed.
check the catributtions if its rare more expensive....
here's the list :
https://cryptokittydex.com/cattributes.whixtensions
ask if u have questions!