There's a way to always get the 2nd prize. The odds for the 1st prize is quite hard. Of course as a rule of thumb, I will not spoil it here they will fix it as soon as I mention it. I got kimimaro halloween, 40 frags or ronin, and sasuke rinne 5 stars that way. I've only recharge 5 times, and 5 out of 5 I got the 2nd prize wether it be crazy slot machine or shinobi feast. I'll give you a hint, you will only got 1 100% sure 2nd prize for one of those wheels.