The Leprechaun is the Wild symbol in this game, paying a nice 5000x the line bet for getting 5 of them. It doubles all wins with it, it substitutes for other symbols except the Scatter and Bonus symbols, and expands into a Wild Reel during the free spins, but appearing only on reels 1, 2 and 3, not appearing on all reels as in the base game. What a shame! The Harp is the Scatter symbol, a dumb symbol that doesn't pay anything for itself, but getting 3, 4 or 5 of them triggers 10, 20 or 125 free spins with all wins tripled. Yes, 125 free spins with a 3x multiplier, and the Free Spins game can be retriggered too. Marvellous! Yes, the retriggers are for real, they do come quite oftenly, and many times too, not like Microgaming's retriggers which are mostly just empty promises.
The Black Pot is the Bonus symbol, the second dumb symbol in this game, but getting 3 or more of them triggers the Bonus Round, whereby you pick-and-grab 3, 4 or 5 coins to win cash prizes. Don't know how many coins can be won in this Bonus Round, but I've won between 15x up to 50x my bet amount. I quite like this Bonus Round game. As for the other symbols, the Crown pays 750x, the Unicorn pays 500x, the Clover Leaf pays 400x, and the rest pay from 200x to 65x, all per line bet for getting 5 of each kind.
During the free spins, the Wild symbol appears only on reels 1, 2 and 3, but it expands into a Wild Reel with any wins. I've had a few times of the 3 Wild Reels, which paid good wins, but I cannot remember now how big they were. Must have been more than 250x the total bet amount, I would say. Pity the Wild symbol doesn't appear on all reels, otherwise this game would fall into the same top category as a few 5-Wild-Reelers game. I also like the retriggers which could come a few times within a Free Spins game, and I've had 4 or 5 retriggers so far, if not more. Shamrock Isle is still one of my current favourites, despite being an old game, but don't let being an oldie game ever fool you!