Royal League: Neptune’s Harem Online Slot

Published: 27 Jul 2021 | Updated: 27 Jan 2023
Game Provider
Maximum win
Progressive Jackpot
Bonus Feature
Ancient Greece, Underwater
Pub Casino

Licensing Authorities and Testing Agencies

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Slot Setup and Betting Options

  • 5 Reels
  • 3 Rows
  • 26.07.2021 Release Date
  • Royal League series Part of a Series
  • Mobile Version
  • £0.20 Minimum Bet
  • £25.00 Maximum Bet
  • £0.01 Minimum Bet Line
  • £0.80 Maximum Bet Line
  • 20 Paylines
  • Win Both ways

Royal League: Neptune’s Harem Online Slot Review

Take the plunge and play the Royal League: Neptune’s Harem online slot. It’s a 5-reel, 20-line game where you get to meet a variety of gorgeous mermaids, on PCs, iOS, Android, or Windows mobiles.

These alluring characters unlock a selection of free spins rounds with various multipliers. You can also trigger a jackpot bonus feature at random. Roll virtual dice to win up to 10,000x your bet in this round.

Royal League: Neptune’s Harem is a medium volatility slot where the average return to players percentage is an outstanding 96.90%. Dive into this game at the top-ranked online casinos today.

How to Play the Royal League: Neptune’s Harem Slot Machine

Load Royal League: Neptune’s Harem to visit a watery world, filled with jewels, seashells, and mermaids. The dark blue backdrop suggests that the action plays out deep underwater, where the Roman god of the sea, Neptune rules. It’s an attractive game, where the appeal is helped by the high-paying mermaid symbols and a dramatic soundtrack. Look to the left of the reels, where you see the 4 Royal League jackpot values.

A bet range of 0.20 to 25.00 is a little less than we like to see, but the 10,000x multiplier from a jackpot round can still lead to big prizes. You can choose stakes with ease, and other control options include an automatic spins mode and fast-play feature.

The paytable lists how much you win from each symbol, with 3, 4, or 5 of the same type across any of the 20 paylines needed to claim a prize. The 4 mermaids pay the biggest prizes, so you’ll want to see these characters as often as possible. Neptune’s trident is a wild symbol that can act as all except the main man to complete wins.

Free Spins & Other Royal League: Neptune’s Harem Slot Features

If bonus symbols land on the outer reels at the same time, you get any of 4 free spins bonus features. Before the games begin, you need to pick from 4 face-down card to reveal which bonus feature will then play out. You can reveal 5, 7, 10, or 12 free spins, and you then enter a second round where cards award win multipliers of 2x, 3x, 5x, or 10x.

This means you could potentially get 12 free games with all wins multiplied by 10x, but could also have just 5 extra games with wins doubled. Whatever happens, the free spins can retrigger with the appearance of more bonus symbols.

The Royal League jackpot feature can start at any time during the base games, but not in the free spins. It plays out on a 7x7 grid of brightly-coloured gems, and you roll dice to select the each type. Once you have enough of a single colour, you claim the corresponding jackpot, with a win guaranteed.

Blue gems award 10x your bet, and green gems are worth 100x. Collect red gems and you win 1,000x the total stake, with gold symbols leading to the top prize of 10,000x your bet.

Slot Features

  • Multipliers
  • Fixed Jackpot
  • Scatters
  • Wild symbol
  • Free Spins
  • Re-spins
  • Quickspin
  • Gamble feature
  • Retriggering

Maximum Win, Average Returns, & Volatility of the Royal League: Neptune’s Harem Slot

The 10,000x win multiplier equals a prize of 250,000.00. While the multiplier is better than most games, the low 25.00 maximum bet level is a disappointment that limits your potential win. An average return to players percentage of 96.90% is well above the usual level, and means you can play the Royal League Neptune’s Harem slot machine for longer with less risk.

It’s a medium volatility game, which strikes a decent balance between prize values and the frequency of winning spins.

Our Thoughts on the Royal League Neptune’s Harem Slots Game

With the notable exception of a limited maximum bet size, the Royal League Neptune’s Harem slot is another outstanding title. It’s a good-looking game that sticks to a popular topic, and it’s overflowing with extra features.

A choice of free spins with multipliers let’s you decide the volatility, and once the jackpot feature triggers, you are sure to collect either the Blue, Green, Red, or the huge Gold prize. Dive in and meet the mermaids at the best slot sites with the biggest no deposit bonuses featured here.


Follow our guide to the best online casinos, where you can play the Royal League Neptune’s Harem slot along with many other games from this popular developer. Be sure to claim a welcome bonus when you join a recommended casino.

Although there are 4 jackpots in the Royal League Neptune’s Harem online slot, these are not progressives, where the value increases until someone wins the prize. The Blue, Green, Red, and Gold jackpots are fixed amounts worth 10x, 100x, 1,000x, and 10,000x the bet.

Bonus symbols launch a special feature of the Royal League Neptune’s Harem slot. Pick from cards and the reels spin for between 5 and 12 times, without the need to place any bets at all. All wins during the round are multiplied by between 2x and 10x.

The Royal League Neptune’s Harem slot machine is fully compatible with Android and Windows smartphones and tablets, iPhones, and iPads. You’ll find that the mobile version works in exactly the same way as the desktop game.

Play the Royal League Neptune’s Harem slot and you encounter an underwater world of precious pearls, stars, and seashells. Four mermaids also appear on the reels, along with Neptune’s trident. Neptune himself is a bonus symbol who awards the free spins.

Ancient gods of the sea are a popular topic, and the Royal League Neptune’s Harem slot machine is one of many the look very similar. Play the Ancient Fortunes Poseidon Megaways slot to unleash a powerful deity across as many as 117,649 winning ways.

The Royal League Neptune’s Harem slot has a medium volatility. Over time, it returns average-sized prizes at an average frequency. High volatility games pay greater prizes, but less often, and low variance games tend to return lots of smaller wins.

Unfortunately, the bet range of the Royal League Neptune’s Harem slots game is quite limited. You can play with as little as 0.20 on each spin, or raise stakes through multiple options to a maximum of 25.00. That highest level may put off many players looking to place big bets.

The average return to players percentage of the Royal League Neptune’s Harem slot machine is 96.90%. That’s exceptionally generous and means that over the long term, for every 100.00 bet on the game, 96.90 is returned in prizes.

The Royal League Neptune’s Harem slots game was released on the 26th July 2021.