Evolution has a very unique free spins feature that I just love!
You are awarded free spins and every time you get a winning combination the symbols will evolve to a higher symbol (if possible). So if for instance you get three J’s, you will get paid for them and all J’s will evolve into Q’s. And the J symbols no longer appears on the reels. It does this with all symbols, but the letter symbols will go to a maximum of A and the picture symbols will go to a maximum of the highest symbol (not wild).
So after some spins it is possible to only have A’s and high symbols left. Making the chance on a big win even bigger.
Because of this feature it is not possible to get more free spins during the free spins.
I enjoy this slot very much and have to say that the free spins bonus triggers pretty regularly. But not always pays out a good amount. It really has to do with how fast you can upgrade those symbols.