Bison
8 or more matching symbols anywhere in view pays a win, with winning symbols removed and new symbols cascading into view and the chance of further wins.
4 or more bonus symbols in view triggers free spins. Choose from 1 of 3 different free spins options, which give a bigger minimum win multiplier in exchange for less free spins or choose the Mystery Free Spins where you can win any combination of free spins and minimum multiplier.