Reign of the Mountain King

Reign of the Mountain King Slot Review

Slot Provider: SG Digital

RTP: 96% | Variance: High | Maximum Win: 10,000x

Our Score: 7.0

Play at Casumo Casino

WHY YOU CAN TRUST THIS REVIEW: The information and opinions on this page are the result of an comprehensive process of information gathering and live game testing by the gambling experts who work at Find out more here.

About Reign of the Mountain King

Reviewed by:

Published Date: 22nd December 2021

How We Review Slot Games

We test and rate all slot games across 5 criteria, assigning a score out of 10 for each and an overall score that is an average of the 5. To build an accurate assessment of each game we gather information from the supplier and play in real play or demo mode. Find out more.

Reign of the Mountain King is the sequel to Rise of the Mountain King, a mystical slot inspired (unsually) by the music of Norwegian composer, Edvard Grieg. Since the original, SG Digial (now Light and Wonder) have toned down the payout potential (from 50,000x to 10,000x) and the gameplay (which is much simpler this time) but this is still an epic slot by any standards. It has 10 paylines and 5 reels and its high variance and powerful re-spins feature with combining multipliers can produce blockbuster wins out of nowhere. Spins start from just 10p per play at any of the slot sites listed on this page.

Reign of the Mountain King Game Information

  • Release Date: 2021
  • RTP: 96%
  • Variance: High
  • Maximum Win: 10,000x
  • Progressive Jackpot: No
  • Reels: 5
  • Rows: 3
  • Paylines: 10
  • Minimum Stake: £0.10
  • Theme:
  • Features: Wilds, Wild Multipliers, Re-Spins

Testing Notes: Here’s What Happened When We Played Reign of the Mountain King

IMPORTANT: To give you an accurate assessment of the games we review our writers play 200 spins. Whilst this is a useful tool to help us review games and to give an example of what might happen when you play, keep in mind that 200 spins is only a very small sample and cannot be used to accurately predict what might happen over another 200 spins. The outcome of all slots play is always random.

Boom Or Bust? Our Session By The Numbers

I played 200 spins on Reign of the Mountain King for free at Casumo Casino to test the game and this is what happened.

  • Stake Size: £1
  • Start balance: £1,000
  • End balance: £939.50
  • Biggest Win: 47.5x
  • Re-Spins Feature: 7
  • Session Time: 23 minutes 24 seconds

It’s all about unlocking that re-spins feature in this game and I managed that 7 times over 200 spins (3.5%). Actually, for a high variance slot I think that’s not bad. It didn’t feel like I had to wait that long between each trigger and the game is entertaining enough in its own right to be able to ride out the quiet spells.

47.5x win from the re-spin feature
Biggest win in testing was 47.5x from re-spins with 2x multiplier wilds

The re-spin feature itself felt very unpredictable.

The best result I got – shown above – was a 47.5x win from 3 re-spins where the multipliers on 4 wilds grew to 2x. On 2 occasions 3 of those multipliers combined to form an 8x multiplier which is how I got the bigger win. Another time I hit a 31.5x win from 2 re-spins. And on 3 other occasions I only had 1 re-spin each time and wins of just 2.5x or less. In other words … unpredictable!

Whilst none of these wins are dramatic, it’s easy to see how a good run in this feature, where the multipliers grow to 3x or even 5x, could produce stunning payouts. It’s just about getting lucky on the day.

What We Liked

  • Awesome Viking castle setting with epic soundtrack
  • Random multipliers of up to 512x in base game
  • Superb progressive multiplier and re-spins feature with epic potential
  • High paying King symbol gets you 20x for 5 on a line
  • Highly volatile for thrilling and unpredictable payouts

What We Didn't like

  • RTP and top payout are lower than the original
  • Only suitable for those who love risky gaming

Reign of the Mountain King Review Scores

  • Theme and Design 7
  • RTP and Variance 8
  • Maximum Win 8
  • Symbols and Paytable 7
  • Features and Gameplay 8

What Our Reviewer Says ...

"A stunning sequel to one of the great 'epic' slots featuring a Viking king and a superb progressive wild multiplier feature with re-spins! What's not to love?!"

Overall Score: 7.0

Theme & Design

Our Score 7

A Truly Epic Production From Artwork To Soundtrack

The production in Reign of the Mountain King is superb. The setting is the castle of a Viking King, inside his banquet hall by the looks of things. The widescreen view shows stone pillars with flaming torches all gilded with gold whilst logs burn in iron fire pits. The inspiration for this game, and the original, is the music of Norwegian composer, Edvard Grieg, and his epic piano pieces morph into metal versions in the re-spin feature for added atmosphere.  It’s a stunning slot game and the audio, visuals and gameplay all make it a powerful piece of work by SG.

Reign of the Mountain King by SG Digital
Reign of the Mountain King – epic production

RTP and Variance

Our Score 8

What is RTP?

RTP (Return to Player) refers to the amount a game will pay out in cash prizes expressed as a percentage of all the money wagered on that game. For example, a 96% RTP means a game will pay out £96 for every £100 wagered. This is an average number and will vary from one session to the next.  Read more here.

What is Variance?

Variance refers to how far a game will deviate from its RTP over time. High variance games deviate a lot and produce uneven win distributions and unexpected windfalls. Low variance games provide a more stable and even distribution of wins. Read more here.

One (small) downside to note: fans of the original Rise of the Mountain King may feel a little short-changed going into this sequel as key stats are a reduction on what you saw in the first slot. In the case of RTP, this is at 96% which is down from 96.31%. I should say that 96% is still about average for an online slot and you won’t notice the 0.31% difference, though as they say, ‘it all counts’!

Meanwhile, the volatility is most definitely still high and will suit only those with a taste for risk. The minimum bet is just 10p (down from 30p) which makes the game a little easier on the balance and makes that volatility more manageable.

Maximum Win

Our Score 8

What Is Maximum Win?

Maximum win refers to the maximum amount a player can win from one spin. It is expressed as a multiple of the stake. For example, where the maximum win is 100,000x, from a £1 stake, the maximum win would be £100,000.  

The biggest drop of all is in the payout potential of the game which has come down from a huge 50,000x to just 10,000x (still good, but modest in comparison to many high variance games these days).

Symbols and Paytable

Our Score 7

20x Payouts For 5 King Symbols And Multipliers Of Up To 512x

The game plays on 5 reels with 3 rows displayed on each at all times. There are 10 paylines to win on, with wins being triggered by landing 3 or more identical symbols on any line from left to right.

The paytable has moderate value, but as we will find out there are some pretty significant multiplier values that come into play, as described below, to help boost those wins towards the 10,000x max.

Reign of the Mountain King Paytable
Paytable with 20x for 5 King symbols

The low payers are the cards, 9 through to Ace. These are valued at from 0.5x for 3 9s up to 5x for 5 Aces. The premiums are themed on the court and weapons of the Mountain King. You’ll find the King himself, along with the Queen, a gem-loving troll, a shield and an axe. These are valued at from 2x for 3 axes up to 20x for 5 Kings.

Interestingly, the King doubles up as the Wild. As well as substituting for other pay symbols to complete paylines he can also bring multipliers of up to 512x into play as described in the next section.

Features and Gameplay

Our Score 8

The features in Reign of the Mountain King have been stripped right back from what we saw in Rise of … and it makes for a much simpler playing experience with laser-focus on unlocking the best multipliers.

This is how it works:

Mountain King Wild Symbol Triggers Multipliers

The Mountain King acts as the Wild. Thats all fine and good. The exciting part is that if he substitutes into a payline for a 4 of a kind or 5 of a kind win, then an additional multiplier MAY be applied to the win. That multiplier can be 5x, 8x, 64x or 521x.

Mountain King Respins And Gem Meter

The other big feature here is the Mountain King Re-Spins. These occur when 3 Wild symbols land on the middle 3 reels on the same spin.

Re-Spins Feature in Reign of the Mountain King
The re-spins feature with wild locking and gems collecting

Now, each wild gets a 1x multiplier and locks in place for a re-spin. Then, if any more wilds lands on reels 2, 3 and 4, they too get a multiplier and lock in place. A wild landing on reels 1 or 5 from the re-spin does NOT get a multiplier.

You will also notice a ‘Gem Meter’ that is visible above the reels. During re-spins, gems land on the reels and when they do they are collected in the meter. For every 3 gems that are collected, multipliers on the wilds in the middle reels increase to 2x, 3x, 5x and 8x.

These wilds may help form wins and when they do, their multipliers are applied to those wins. The best part is, where more than one multiplier is used in a win, then they are MULTIPLIED together. So, a 5x and a 5x would make a 25x. You can see how these can become very powerful when there are a few appearing in winlines.

The re-spins round only ends when no more gems or wilds drop, OR you hit that maximum 10,000x payout!

The Final Verdict

I think this is a fantastic slot with superb production and a fine-tuned re-spins / multiplier feature that will appeal to high variance slots fans everywhere. It may not have the same super-high max win as the original, or the same free spins round, but for me that doesn’t matter. The progressive multipliers and the gem collection meter are an exciting way to build blockbuster payouts as we got a glimpse of during our testing spins. And despite its volatility, there was rarely a dull moment. Combine all that with the epic soundtrack providing backing throughout, and awesome visuals, and this is a game to come back to again and again.

Useful Tips When Playing Reign of the Mountain King

Remember, online slots are games of chance, there is NO strategy that can improve your odds of winning. However, reading our review and following these tips will help you get the most out of your time playing this slot game.

1. The Mountain King Is The Most Powerful Symbol Here

All good things start with the Mountain King symbol. Not only does he have the highest value in the paytable but he also unlocks 512x multipliers and the re-spins round. Keep your eyes peeled – he appears A LOT too as testing showed!

2. Look For The Gem-Loving Troll During Re-Spins

The gems, to be collected in the meter above the reels, are provided by the troll during re-spins. You need to keep collecting these to grow your multipliers so look out for the troll for the best overall wins.

3. Start At A Low Stake

To give yourself the best chance I recommend playing at a low-ish stake. That is because this is a high variance game and it can be tight and burn your balance very quickly. With small bets you can make your funds go further whilst chasing down the re-spins feature.

4. Only Play At Licensed UK Slot Sites

I recommend only playing at licensed sites like the ones listed on this page. We have chosen these because they are licensed by the UK Gambling Commission which means they are safe, fair and secure.

Who Made Reign of the Mountain King?

  • Name: SG Digital
  • Established: 1940s
  • UK License: 41115
  • Total Games: Over 2,000
  • Known For: Huge aggregated catalogue of slots from many big names
  • Popular Slots: Rainbow Riches, Raging Rhino Megaways, Battleship Direct Hit
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