Emerald King Rainbow Road review. Play Emerald King Rainbow Road at LeoVegas Casino today! It's one of many casino games available including slots, table games and live dealer games. Play Emerald King Rainbow Road at LeoVegas Casino, just one of the many casino games on offer including slots, table games and live dealer tables. Filled with fun details, Emerald King Rainbow Road isn't just another lucky leprechaun slot game. Filled with fun details, Emerald King Rainbow Road isn't just another lucky leprechaun slot game. . Play Emerald King Rainbow Road at LeoVegas Casino, just one of the many casino games on offer including slots, table games and live dealer tables. Emerald King Rainbow Road review.