Pragmatic Play


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About Mysterious Slot

Roam the reels in the Mysterious slot developed by one of the best online casino developers Pragmatic Play whose list of casino games have taken pride of place here at 21.co.uk, touching on a wide variety of unique themes and genres for our players to discover - from the hensational Great Chicken Escape to the sugary mountains of the Sweet Bonanza. Now delving into the realms of the supernatural with the Mysterious slot, allowing you to spin through a Victorian-style city where ghostly Barons and Lords could hold the key to unlocking some spectre-acular winning potential.

On the face of it, the reels are a simple 4x4 setup adorned with metallic animal motifs that resemble olden door knockers such as Rams, Owls and Beasts, as well as a titular “Mysterious” symbol - with the latter standing as the highest paying icon on the paytable, offering a payout of up to 25x your stake. However, despite its smaller reel set, the Mysterious slot base game offers players a magnificent 256 ways to land a winning combination across - players should also look out for the elusive Free Spins symbol making an appearance across the reels, as landing 3 or more will transport you to an even bigger 6x4 reel set where you could be awarded up to 12 free spins to play with up to 4096 ways to win over 9,000x your stake in play.

Play the Mysterious slot here at 21.co.uk, available to spin across mobile, tablet and desktop devices.

How to Play Mysterious Slot


To set your stake in the Mysterious slot, use the (+) and (-) keys to toggle through the available bet amounts until you reach a total value that’s best suited to your bankroll.


Once your stake is set and you’re ready to play the Mysterious slot, hit the spin button to trigger a single spin, randomising the reels and deducting the set bet value from your balance - any winning combinations will be highlighted at the end of the round.

Mysterious Slot Special Features

Random Spin Features

Activated on any spin, the Random Spin Features present players with 3 unique bonuses to use in your pursuit of winning paylines, bringing additional Wilds and Multipliers to the reels.

Free Spins

Trigger the Free Spins feature by landing 3 or more of the elusive Free Spins symbols across the reels, where players are awarded up to 12 free games to be played out across a bigger 6x4 reel format.

Locking Multiplier Free Spins

Landing a Clock symbol will award a random multiplier between 3x and 12x that applies to your total win made during the free spins. Land two at a time and you will be awarded 2 additional free spins with the multiplier locked in throughout.

Resurrecting Roaming Wilds Free Spins

Any Wild symbols that appear on the reels will fade after each consecutive spin, moving onto a new place on the reels with the ability to return at the end of any played free spin if any further Wilds land on the reels.

21.co.uk Review

Here at 21.co.uk, we play host to a handful of slot games with a supernatural stature, including the ever-popular Immortal Romance slot, but we’ve never seen anything quite like Pragmatic Play’s Mysterious slot - a casino game that transports players into the heart of a spooktacular Victorian setting, where the resident spirits could hold the key to free spins, mega multipliers and wins of over 9,000x your stake.

Take Time to Think | BeGambleAware.org | 18+

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