As far as I am aware there are no real signs when this one is going to give the big roll. Although I have noticed it is a good sign if it's backing and playing real shit!! They usually suck a bit in before giving the 75-100 roll. Personally, I play this machine for the first big win it offers - unless backing, in which case I would go for the crazy spin roll. Not a bad machine to be honest. Two tips - don't bother gambling one spin, just spin it, as I dont think you can get crazy spins from 2 or more spins. Also, always hold sevens around the win line to try to force a mixed seven win.