it says I have to play multiply BTC or buy lottery ticket, but how much should I spend?
It depends how much you have received from free rolls and what your balance is as all those things are taken into consideration for the calculation.
Thanks for the reply.
Do you know the formula or how to calculate?
I would like to know how much to spend to decide, I don't want to just start spending and hoping for the best before knowing exactly how much.
What is the point if it is going to cost me half of what I got?