With its lively graphics and wacky soundtrack, this Irish-themed slot machine takes players to a fantastical realm teeming with leprechauns and gold pots. Bonus Features and Captivating Game Play. Free sdefine slotspins & pick-me-up games are just two of the bonus features that "Rainbow Riches" offers players, giving them plenty of chances to greatly increase their winnings. "Gonzo's Quest," which has a devoted fan base since its debut, is another noteworthy title. Players accompany the daring adventurer Gonzo on his quest for lost riches in the ancient South American ruins in this adventure-themed slot machine.