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King Neptun

Review, Demo Play, Payout, Free Spins & Bonuses

King Neptun is an online slot created by Octavian. It is a medium variance game with 243 ways to win across five reels, an RTP of 96 per cent, and a mythological theme.... Features include stacking symbols, scatters, sticky wilds and a bonus round.

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  • Bonus round and free spins
  • Medium volatility
  • Large prize for five scatters
  • Relaxing experience
  • Small wins in the main game
  • Fairly standard theme


Dive into the world of King Neptun in this mythological-themed slot with 243 ways to win. Explore the ocean and discover how stacked symbols can become scatters that will pay out for two or more appearing anywhere on your screen. You can also find pearls in the bonus round and see whether you can make a splash and swim through four different levels.

Theme, graphics & soundtrack 

The theme of this slot is the Roman god of the sea, Neptune. It is an oceanic adventure filled with pearls, ships, lobsters, mermaids, fish, tridents and shells. The graphics are clear and theme-focussed throughout, with the action accompanied by a soundtrack with gentle waves that is not nearly as repetitive as some. If you like this theme, you may also enjoy the Neptune's Fortune Megaways slot

King Neptun

King Neptun RTP and variance

This Octavian slots game has an RTP of 96 per cent and is medium variance. This makes it a middle-of-the-road choice that will suit all types of player and playing styles. 

How to play King Neptun

There is not too much that you need to know before starting to spin with King Neptun, but here are a few pointers before you dip your toe in the water:

  1. If you are playing on a desktop device, the three-line symbol is the key to all the information you need, from choosing your bet size to looking at the paytable and the possible wins on offer.
  2. Choose your total bet between 0.50 and 75.00. You do not need to choose the number of paylines.
  3. All wins pay from left to right. The scatter is the exception to this rule and will pay out for combinations wherever it lands on the reels.
  4. The highest-value win that lands in a spin will be the one that pays out.
  5. Scroll through the paytable section to find more information about the game’s bonus features.
  6. The speaker volume tab enables you to alter the volume of the soundtrack or mute it completely.
  7. Access the autoplay feature and choose how many automatic games you want to play. The maximum choice is 10,000 rounds.

Bet sizes & paytable wins

You can start betting on King Neptun with a minimum stake of 0.50. Win information can be found in the paytable; however, to give you an idea of the prizes on offer, here is what you could win for five-of-a-kind symbols: 

  • Neptune = 3.00
  • Trident = 1.50
  • Ship = 0.75
  • Ray = 0.50
  • Lobster = 0.30
  • Blue shell = 0.30
  • Starfish = 0.25
  • Green shell = 0.25
  • Coral = 0.25

King Neptun bonus features 


The mermaid is the wild of the game and can replace any symbol except the free spins or scatter symbols to help create wins. There is also a mystery symbol that can change into any of the other icons except Neptun.


Neptun has his own powers and two of his stacked icons will become a scatter. You will get a prize for having at least two scatters anywhere on your reels. This is what you can expect to win if you land these number of scatters:

Five scatters = 2,000x total bet
Four scatters = 200x total bet
Three scatters = 20x total bet
Two scatters = 2x total bet

Bonus round

The four-level bonus round in the game is triggered by landing three bonus symbols. Each level will offer you the chance to pick a shell from a choice of three. In the first three rounds, the shell could contain:

A win plus a pearl to access the next level.
A win and no pearl, which means the end of the round.

In the fourth level, shells will only contain a win and then the bonus round will finish.

Free spins

If this is still not enough, this mythology themed slot offers the chance to enjoy a free spins feature. Get three of the game’s wilds stacked on a reel and you will be awarded free spins and a 2x win multiplier based on your bet. You can win either two, four or six spins and the sticky wilds that started the feature will stay on your reels until the free games are played. You can also get extra games if free symbols land on your reels during the bonus. You will get one free game for each free spins icon that lands.

King Neptun review: our verdict

This game is all about the bonuses and special symbols it features. You will never make a splash with the standard wins in the main game; however, it could be worth taking a paddle in the ocean if you fancy a 2,000x prize for landing five scatters.

The four-level bonus round is quite entertaining and it feels like there are plenty of winning opportunities during the free spins feature thanks to the 2x multiplier and the sticky wilds. The game also looks appealing and the soundtrack is quite soothing. If you are looking for a medium variance game that offers quite a relaxing and enjoyable experience, this could be a good choice for you.

Disclaimer: King Neptun trademark / license is owned by Octavian Gaming. This site is not endorsed by Octavian Gaming.

Slot Data
Slot Name: King Neptun
Software: Octavian Gaming
RTP: 96.00%
Paylines: 243
Reels: 5
Min Bet (all lines covered): £0.50 (GBP)
Max Bet: £75 (GBP)
Top Win: 2000
Features: Bonus Game, Wild Symbol, Free Spins, Expanding Wilds, 5 Reels, Stacked Symbols, 243 Ways, Mystery Symbols
UK Available in UK? No. :maker does not have a UKGC license and cannot offer their games at UK licensed casinos.


Can you win free spins with King Neptun?

Yes, you can be awarded two, four or six free spins. You can also land free spins symbols during the bonus to get extra free spins.

Are the standard wins large in the King Neptun slot?

The standard wins are not the major appeal of this game. The winning combinations in the main game pay out relatively small prizes but there are larger wins that could be won thanks to the bonus features.

Is there a bonus round in the King Neptun slot?

There is a bonus round that enables you to pick shells and prizes. You can move through four levels if you are lucky enough.

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