Shamrock Lock, released in 2015, is unashamed in its classic Irish theme. The slot's palette is almost completely made up of greens and golds, while the reels themselves abound with clovers, pots of gold, and bright green leprechaun hats. It's a quiet slot with no steady background music, although upbeat Irish jingles will play out to celebrate wins, and a joyous celtic jig plays out when players unlock the game's Wonder Spin Bonus.