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Pragmatic Play
RTP 96.5%
Play Pragmatic Play Slots
Reels 4
Paylines 256
Min bet size 0.1
Max bet size 100
RTP 96.5
Wild symbols Yes
Free spins Yes
Bonus No
Jackpot No

Top Casinos: United Kingdom

Mysterious Slot Review

Released February 2020

The Mysterious slot game can be found at casinos offering Pragmatic Play software. Pragmatic Play are one of the newer slots game developers on the market but their products are polished and professional in feel and operation. As a standard Pragmatic Play do publish the RTP/House Edge information for their slots games within their game help file. For a provider that are not currently licensed within the UK market and therefore are under no obligation to publish these figures this is a significantly progressive move. The House Edge for Mysterious is 3.5%.

Mysterious is a 4 reel game that is 4 symbols high. The game does not use standard paylines, instead you form wins when you land 3 or more matching symbols across adjacent paylines, with 256 ways to win in total. However, during the Free Spins the number of reels will increase to 6 and 4096 ways to win.


This slot has a Victorian gothic theme, like something out of Sherlock Holmes or Jekyll and Hyde. There are 3 central characters, all dressed in Victorian garb and the streets depicted in the background screen look like something straight out of a Dicken’s novel. You have a haunted house on top of a hill, lightning strikes, a full moon and rolling mist that bring in the sense of the gothic.

Special Symbols

Wild – Wild symbols don’t come as a part of the base game but are introduced during the Free Spins and the Random Spin Features that I will describe in the Bonus Features section. I will comment on the Wilds during those sections.

Free Spins – You need to land 3 or more of the Free Spins symbols anywhere on the reels to trigger the feature.

Bonus Features

Random Spin Features – There are 3 different Random Spin features that can trigger on any spin. However, only the one that is highlighted has a chance of triggering. You will see which Random Spin feature is highlighted on the left-hand-side of the reels. The Random Spin features are as follows:

The Lord – If this feature triggers then “Lord” Wild symbols are added to the reels. “Lord” Wilds will substitute for all symbols, other than Free Spins symbols and other Wild symbols. “Lord” Wilds can come with a multiplier, up to x5 the bet.

The Lady – If this feature triggers then “Lady” Wild symbols are added to the reels. “Lady” Wilds will substitute for all symbols, other than Free Spins symbols and other Wild symbols. There is a chance that Lady Wild symbols will expand to fill a reel with a mystery symbol chosen at random.

The Baron – If this feature triggers then “Baron” Wild symbols are added to the reels. “Baron” Wilds will substitute for all symbols, other than Free Spins symbols and other Wild symbols. “Baron” Wilds can infect vertically adjacent symbols, turning them into additional Wilds.

Free Spins – If you land 3 or 4 Free Spins symbols then you will be awarded with 8 or 12 Free Spins respectively. During the Free Spins the number of reels will increase to 6 and as such the number of win ways will also increase. Before the feature begins you need to choose between Locking Multipliers or Roaming Wilds:

Locking Multipliers – The “Gold Clock” symbols are Locking Multipliers and if one lands on the reels it will award a Multiplier, up to x12 the bet, to any wins that you land. If you land 2 then they will do same, but will also award 2 additional Free Spins, during which they and the multiplier awarded will lock in place.

Roaming Wilds – Any Wilds that land will become faint and move around the reels on the next spin. If any new Wilds land there is a chance that the Roaming Wild will be added to the reels. This process continues, with the number of Roaming Wilds increasing.


Mysterious is an impressively designed slot, up there with the very best that PragmaticPlay has to offer. Rich and detailed symbols design compliment the intricate background in a slot that you can see the time and effort that has been applied. You get Free Spins with two options for additional features. Your Free Spins also increase the size of the reels. You get 3 random features that bring Wild symbols with them and you get an excellent house edge. This is one we would definitely recommend.

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The United Kingdom of Great Britain and Northern Ireland sits to the north-west of mainland Europe. The United Kingdom shares a border with The Republic of Ireland and has coasts on the Atlantic Ocean, Celtic Sea, North Sea, Irish Sea and English Channel. The population of the UK is approaching the 67.6 million mark leading to a fairly densely populated land mass. The gambling sector in the United Kingdom is entirely regulated and licensed by the UKGC – the United Kingdom Gambling Commission. Should players resident In the UK wish to gamble with foreign based operators there is no history of this being treated as a criminal offence, but high levels of protection exist for UK residents playing with UK licensed operators.


The above information is what we believe to be the the legal status of online gambling, however information on this topic is limited and hard to find. We accept no liability for any errors or ommissions. It is the reader’s responsibility to ensure that they know the legality of online gambling in their country before engaging with any online gambling service.