The 20 payline slot game is visually pleasing, with the reels sunk to the bottom of the ocean. Play For Free. Play For Free LeoVegas Casino Jackpot City Casino Nomini Casino Casino CASINO OF THE MONTH. The developer's gaming library consists of video slots crafted to run seamlessly on mobile and desktop devices. Spin City Lux. (5 votes) | Vote this page! Microgaming Casinos. Play at [HOST] for real money and get a Welcome. +. . LeoVegas Casino The last feature is Neptune's Harem's Royal League jackpot, which is totally random. Titles like Piggy Luck, Neptune's Harem and. Microgaming & Gong Gaming joined forces to release Royal League Neptune's Harem slot with its classic theme and RTP of % for every player to enjoy! Royal League Neptune's Harem has a jackpot prize of up to x your stake and a free spin feature. Royal League Neptune's Harem. There is a free spin feature that can award you up to 12 spins.