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Mystery 7s Slot - Review, Free & Demo Play

Mystery 7s is a video slot that was first launched on 21/07/2017 by iSoftBet. This is a bright and dynamic slot that can take you back to the good old days of land-based casinos and old-school slot machines. The game has got quite a decent RTP and a range of bonus features capable of increasing your wins. Keep reading this review to find out more about this intriguing slot.

Mystery 7s Free Play

Mystery 7s logo
iSoftBet Release Date: 21.07.2017
Rating by Joe Booth
User’s Rating:
Not rated yet
Mystery 7s
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  • Mostbet Casino logo
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    Royal Reels  review
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    Sloterra  review

General information about Mystery 7s slot

Release Date:
Max. win:
Bonus game:
Free spins:
Scatter Symbol:
Wild symbol:
Symbol Stacked:
Jackpot Game:
Slot lines:
Slot reels:
Stakes range (€/£/$):
0.25 to 25
Slot Theme:

How to Play

In order to start playing Mystery 7s right now, follow our instructions:

  • Launch the game and wait while it’s loading
  • Find and click ‘i’ to check out the slot’s paytable and available bonuses
  • Use the triple-bar button to adjust the game’s volume and sounds
  • Set your total bet between €0.25 and €25
  • Click the green circular arrow button, and the first round will start

Mystery 7s is a video slot with 5 reels, 3 rows, and 25 fixed paylines. Before you start spinning the slot, you have to select the coin value below the reels. Given that the slot has 25 fixed paylines, each spin will cost you 25x your selected coin value. There are several bonus features that you can activate throughout your game in order to increase the winning potential of your bets. We will talk about the bonuses available in Mystery 7s in a separate section of this review.

Mystery 7s RTP and Volatility

Mystery 7s has got an RTP rate of 97.4% and medium volatility.
RTP and volatility of any online slot machine can demonstrate possible payouts and frequency of winning combinations whenever you make your spins in a slot. Don’t forget that these factors are only theoretical and can change depending on active bonus features that can greatly increase the winning potential of your wagers. Mystery 7s has an RTP of 97.4%, which is slightly higher than the industry’s average that’s set at 96%. Besides, the combination of quite high RTP and medium volatility create the possibility for frequent small payouts. Don’t waste your chance to activate as many bonus features as possible in order to make your spins in Mystery 7s even more profitable.



Mystery 7s is a slot machine with a classic theme and symbols that we are all used to”: Sevens, BARs, golden starts, shiny colorful diamonds… the game’s interface has an animated background that represents stars floating in space. The background animation is so smooth and charming that it’s easy to get distracted by it and forget to actually spin the slot. Even though Mystery 7s hasn’t got some extraordinary concept, its classic and well-known theme has played out perfectly, gaining numerous devoted players who are looking for both a relaxing and captivating gambling experience.

The basic paytable in Mystery 7s includes 3 “BAR” symbols with different values as its low-paying symbols. The high-paying symbols are represented by a golden star, 2 “Sevens”, and a shiny purple diamond as the most valuable regular symbol in the slot. The special paytable includes only one symbol, the Bonus symbol that triggers the slot’s bonus game.

Mystery 7s
Mystery 7s slot - payouts

Mobile Compatibility

Mystery 7s slot mobile
If you want to play Mystery 7s using your Android or iOS device, that won’t be a problem. Thanks to the latest Javascript and HTML5 technologies, this slot machine is fully compatible with all mobile devices. Just launch the slot in your mobile browser and enjoy your spins without any additional downloads.

About iSoftBet

iSoftBet is a prominent and highly reputable slot provider that has been operating in the industry since 2010. Given that it has such impressive experience in developing slot machines, no wonder why all new products by iSoftBet always get highly praised by gamblers and casino reviewers all over the world. If you choose to place your bets in video slots by iSoftBet, you can always benefit from such lucrative bonus features as bonus games, free spins, stake multipliers, expanding symbols, and more.

Bonus Rounds & Free Spins


Bonus Round

The Bonus round in Mystery 7s is activated by 3, 4, or 5 Bonus symbols on the reels. This feature gives you a chance to win up to a 600x stake multiplier or Free Spins and bet multipliers up to 5x. During the Free Spins round, all bonus symbols appearing on a gameboard will pay out as Scatters.
Mystery 7s slot - feature

Free Spins

As soon as you activate the Free Spins round in Mystery 7s, all Bonus symbols in the view will start paying out as Scatters with the following values:

  • 2x total bet for 3 symbols
  • 15x total bet for 4 symbols
  • 30x total bet for 5 symbols

Mystery 7s Demo Play

Now that you’re familiar with game mechanics and all the bonus features of Mystery 7s, it’s time to check out this slot machine yourself. In case you’re not ready to play for real money yet, just launch our free demo version displayed below and try out this slot machine just for fun.

Max Win

The max win you can achieve in Mystery 7s is 2,000x your bet.
The top win in Mystery 7s is 2,000x your stake, which is reasonable since this is a slot with high RTP and medium volatility. However, we are sure that this jackpot can jump much higher if you actually get an advantage of all bonus games, free spins, and stake multipliers available in the slot. The sky is the limit, so go grab your wins!

Overall Rating

Mystery 7s is a classic and well-developed slot machine that catches your attention from the very first spin. Even though there is no innovative concept or idea at its core, Mystery 7s has gained a lot of fans who value simplicity in slot machines. The game has got wonderful graphics, a decent return to player, and several bonus features that can greatly multiply your total bet. That is to say, we see no reasons why you shouldn’t try out Mystery 7s right now!
High RTP
Fascinating design
Free Spins
No progressive jackpot

Mystery 7s Slot - FAQ

Do I Need to Make a Deposit to Play this Game?

You can make a deposit in a trustworthy casino or play Mystery 7s for fun using a free demo version presented in this review.

What is the Most Valuable Symbol in Mystery 7s?

The most valuable symbol you can find in Mystery 7s is the Bonus symbol that activates the bonus round.

What is the Return to Player (RTP) rate of Mystery 7s?

Mystery 7s has got an RTP rate of 97.4% and medium volatility.

Can I Earn Real Cash Prizes in Mystery 7s?

Yes, but you have to register an account in a reliable online casino and make your cash deposit first.

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Joe Booth
Joe Booth
Expert in: News, Blog, Slot reviews
Joe is an expert online casino player, who knows all the tricks and tips on how to get to the most massive wins. He is also an experienced online casino games reviewer, with hundreds of written articles behind him, on all kinds of online casino games. He makes sure to play them, see how they work, and then gives his honest expert opinion about them to other players, our readers. 
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