Calaveras Fortuna by Spinberry features a Calavera Wild Conversion mechanic. Conversion symbols can land on reels 1, 3 and 5; each one turns itself and a different random symbol into Wilds.
Landing three, four or five Free Spins symbols awards 10, 20 or 75 Free Spins, respectively. The Wild feature remains active during the bonus round. Use the demo version to play for free and practise before playing for real money.