Mystery Stacks Slot

Mystery Stacks Slot Review

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  • 3x3 Mega coin symbol that offers guaranteed wins
  • Mystery coins that flip to identical symbols to create a winning combo
  • Not many features to see massive wins

Quick Verdict

When you come across a name like Mystery Stacks slot, you would be thinking that it is a mystery and serious title. On the contrary, it is a perfect amalgamation of classic fruit theme with modern 3D graphics, features, and gameplay. Developed by Silverback Gaming studio to Relax Gaming, it has plenty of features and big symbols that can land massive wins. With an average RTP of 95% and medium to high volatility, the odds of seeing the big wins are not far away.

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Mystery Stacks Paytable
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Basic Details of Mystery Stacks Slot

Developer:Relax Gaming
Mystery Stacks RTP:95%
Mobile Compatibility:Yes, Phone & Tablet
Theme:Classic Fruit Machine
Bonus Features:Mystery Coin, Mega Coin

More Info about Real Money Mystery Stacks Slot

Silverback gaming is the creator of this title. It is part of the very popular online gaming software supplier Relax Gaming. Silverback started its venture in the online gambling field in 2019. Its main purpose is to deliver quality and feature-rich mobile gaming content for the gamblers. With the strong backing of award-winning Relax Gaming, this studio is all set to create many ripples in the iGaming market. 

The Mystery Stacks real money slot comes with 3 rows, 5 reels, and 10 paylines. This has the classic fruit machine theme and comes with more modern-day features to add some spice to gambling. The traditional brick and mortar machine is given a complete makeover and the mystery coins helping in driving some big wins. It suits both the low and the high rollers, as the minimum and maximum betting options are €0.10 and €1000.00 respectively. This is an HTML5 slot and hence it works on a wide variety of handheld devices like smartphones and tablets. With features like the mystery coin flip and mega coins, you can see some big wins come your way. Relax Gaming allows avid punters to try it out for free in many of the licensed online casinos. Visit your favourite gambling website to try it before you place real money stakes. 

What does Mystery Stacks Slots’ Story Look Like? 

Mystery Stacks Slot Look & Feel

This is a simple fruit-themed game and hence there is not much of a storyline on offer. The classic fruit theme is what this game is built on. The big difference that you find in this title and many of the other similar titles is the use of quality graphics and modern-day detailing. The reels set of the real money Mystery Stacks game does not look like a classics one despite having the fruit machine theme. 

The big difference is in the grid layout that comes with 3 rows and 5 reels. This is not a common sight in the physical casinos. All the common icons you associate with this traditional theme are part of the symbols setup. You have the low valued symbols represented by the cherries, lemons, oranges, plums, and watermelons. The medium to high paying icons are single, double, and triple bars. The Highest Paying symbol is the golden bell.

Graphics, Sound, and Looks

Even though this is an old school game, it has all the modern-day and futuristic looks. When you load the title on the screen, the purple background screen with the game’s name on it welcomes you to the grid. Hit the play button and you enter a neon-lit reel set with a bokeh effect light background. The reel’s frame comes with neon lights that vary from purple to pink shades all through the play. You can find the control menu at the bottom of the grid. The symbols are set on a purple background. A jazz kind of music plays in the background during a round and it varies for every spin. The reel-spinning sounds and the sound that comes during a win adds to the excitement of the play.  

Key Features You Find in Mystery Stacks Real Money Game

A look at the features of this title on the info or paytable page will make you feel that this is a different game. It does feature the fruit icons and the classic theme but does not offer the regular Wild or Scatter symbols. So, without the Wild icon, there is no way of replacing the low valued symbols to create winning combinations. Also, with no Scatter, you cannot come across the Free Spins option. So, then what are the special features that help to land the big wins when playing with real money? The big wins come your way courtesy of two mysterious icons, the mega coin and mystery coin. This is not the usual symbol seen in many fruit-based machines. 

  • The mystery coin icon can land on any of the reels during a spin. If these symbols land on the grid, it opens up a new winning chance. Here, the spinning reels come to a halt once the mystery coin lands on the grid. As soon as they land on the reels, they flip to reveal the same symbol. So, having more number of mystery coins on a spin can boost your winnings. The coins flip a maximum of 5 times and they reveal the hidden symbols every single time. The more coin flips, the more wins you gain. You get the payouts for the wins made after the final flip. 
  • There is also a chance to land a mega coin icon on the reels during a spin. This happened on a random spin. The mega icon comes as a huge 3×3 coin. If you happen to land this mega 3×3 size coin, you are guaranteed a win. The coin will reveal the hidden prize once it lands on the reels. This will help in boosting the payouts. 

Mystery Stacks Slot: Return to Player Payout Ratio

The industry average Return to Player (RTP) is 95% to 96%. The Mystery Stacks RTP is 95% and hence it falls in the high paying slots category. This means that it meets the industry average payout ratio. RTP is nothing but an indication of the average money the title gives back to the player. With this percentage, you can expect to win €95 for every €100 you wager over time. It does not happen with just a few hundreds of spins. It might take several spins. The remaining 5% goes to the casino as the house edge. What you can conclude for this RTP payout ratio is that this is a game based on luck. It is like a scratch card where you can see a big payout on one scratch and no wins on many other times. 

Real Money Mystery Stacks Online Slot Paytable 

It is important to check out the paytable in detail before letting the reels spin. By checking out the paytable, you have a better understanding of the high paying symbols. You also get to know the important symbols that can boost your wins.

  • The liberty or golden bell is the Highest Paying symbol. Land 3 to 5 of them consecutively on the payline to land a win as mentioned in the paytable. You can win a maximum of €50,000 for landing 5 liberty bell symbols on the active payline. This happens when you bet with the highest stake of €1000.00.
  • The triple, double and single BAR symbols complete the set of high paying symbols. These are common symbols in most fruit machines. Landing 5 ‘Triple Bar’ icons adjacent to each other offers you a maximum win of €40,000 for the highest bet. The double bar and the single bar come with maximum payouts of €30,000 each for creating a winning combination of five of a kind on the betway. This is a huge payout to gain when playing with real money.  
  • The medium paying icons are watermelons and berries. They offer you the payout as mentioned on the paytable for landing 3 or 5 identical icons on the betway. 
  • The lemons and cherries complete the fruit icons and are the Lowest Paying symbols.

How to Play Mystery Stacks Slots?

It is very easy and simple to play this title. You can find the ‘Control Menu’ options at the bottom of the game screen just below the 3×5 grid. 

  • Hit the Bet option up arrow key to find the various betting options. Choose from a minimum of €0.10 to a maximum of €1000.00 per spin.
  • Once you choose the stake, just press the Big Spin button at the right bottom corner of the screen. The reels will start to roll. It comes to a stop after a few rolls to reveal if you have landed similar icons on the payline. This is the manual spinning option.
  • You can choose the auto option right side of the best option to let the reel spin automatically. Press this option and choose the number of uninterrupted spins. Hit the ‘Start’ button and the reels will roll continuously for a fixed number of times.  
  • If you would like the reels to spin fast, just press the ‘Turbo’ mode to set it in on position. Then, hit the big Spin button to boost the reel spin speed.

If you land three or more identical symbols consecutively on the active betting line, you win the corresponding payout for that icon. You can see a win for having the icon sequence from left to right, or right to left, or in the middle. 

Strategies and Tips to Win Mystery Stacks Real Money Video Slot

One tip is to try the free demo mode a few times before settling down to place real money bets. This is very important as you get to know more about the game and its features by trying the free play mode. Make sure to place medium-sized bets at most times and occasionally go for the higher bets to prolong play. 

  • This title just needs adjacent symbols on the reels to offer a payout. So, spinning and landing three identical icons on the reels is sufficient to win. The winning symbol can even start on the middle reel. You can see wins come your way for having symbol combinations from right to left and left to right. 
  • Try landing as many mystery coins as possible anywhere on the reels. They will flip to reveal identical symbols to help create good wins. With no other features, you can expect to see the flip coins show up in a regular manner. The only thing is to have them flip to the symbols that can trigger big wins. 
  • The mega coin is a big 3×3 symbol that shows up at random during a spin. If this icon appears, it guarantees a win. So, try landing this mega coin at times on the reels so that you land a win. 

Do not quit before you spin for at least 100 to 150 times. It offers a maximum payout of 500x the bet. So, you need to be patient to try to hit this massive prize. 

Mystery Stacks Slot: Closing Thoughts

The Mystery Stacks slot is a fantastic slot to try out on mobiles, laptops, computers, or tablets. It plays without any issues on all devices, thanks to HTML5 technology. Silverback Gaming has added a fresh look and feel to the very common fruit machine theme. The mysterious coins are a welcome sign that gives a refreshing and modern twist to the old schooled game. The coin flip is a great and innovative addition that excites the gamblers to try more. It can help in gaining nice wins. The best part is that you get a feeling of getting a second chance on seeing some wins as they show up on the grid. 

There is no need for more features when you have the flip coin and mega coins features. Whenever you land mega coins on the 3×5 grid, you can see an assured win come your way. What more do you want? Try the slot in demo mode and you will want to start playing it with real money. You should be ready for the long haul, as this game gets exciting with every spin and special feature that hits the reels.   

Pros and Cons 


  • 3×5 grid that is not common for fruit slots.
  • 3×3 Mega coin symbol that offers guaranteed wins.
  • Mystery coins that flip to identical symbols to create winning combos.


  • Not many features to see massive wins.
  • High volatility and hence suits only high rollers. 


  1. Can I Play Mystery Stacks for Free?

Yes, you can play this title for free at all the licensed and regulated online gambling websites that run Relax Gaming titles. 

  • Do I Need to Register to Play Mystery Stacks for Free? 

No, most of the online gaming sites do not ask their users to sign up for an account to try any demo mode titles. A few might need you to register to play free. 

  • Does Real Money Mystery Stacks Come with Free Spins?

No, it does not have any Wild or Scatter symbol. The Scatter is the main symbol that triggers the Free Spins in many video slots. Here, you will not find any free rounds or Re-Spins. 

  • How to Play Mystery Stacks with Real Money?

Choose a casino that offers this title. Sign up for an account, deposit money in the account, and you can use this money to play with real stakes.

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