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Seven 7's slot review

Added by Crazy Tooth Studio. Information last updated: 16/04/2021

User rating:

- (0)

Expert rating:

3.8 (1)

Game information

Game supplier: Crazy Tooth Studio

Release date:02/2020



Max. win:bet x 25000

Mobile version:Support all devices

Play Seven 7's


Sticky re-spins

Expanding reels

Multiplier wilds

Non standard reels

Max. win


Classic slot


User ratings (0)

Game design:



Game sounds:

Mobile gaming:



Screenshot Screenshot Screenshot
RTP (Return to player):
Max. win:
bet x 25000

Bojoko score (compared to other slots on Bojoko)
Crazy Tooth Studio score (compared to other slots of supplier)

Expert's review Trystan Michielsen

Slot tested

Seven 7s is a Crazy Tooth Studio slot that takes the original fruit machine concept and augments it slightly to create a new type of game. Here you’ll encounter 1 payline on 1 row with 1 winning symbol. Get 7 symbols in a row and that’s a jackpot. Sound simple enough.

This slot was released in 2020 and offers some impressive graphics, even though there isn’t a lot to it in terms of setting or theme. The game seems clearly inspired by those classic fruit machines that were present in bars and casinos back in the day. The playing field is surrounded by extravagant copper and teal patterns, constantly shining and moving.

Meanwhile, the game revolves around a single payline that grows as the game proceeds. The slot only features 3 total symbols, with them having their own purpose. These symbols are big when they appear on the screen and give players a clear view. They are decorated and move when they appear on the reel as well. It’s all rather rudimentary but done in the best way to make it look more entertaining.

To keep the player somewhat engaged the slot plays a whimsical but rather generic song in the background. It has an upbeat tune and a good tempo but doesn’t feel very connected to the classic fruit machine setting the game seems to be aiming for. Instead, it has some nostalgic overtones that reminded me more of the outdoors than an old-school slot.


Seven 7s really doesn’t have a lot of symbols that are used in the game. In fact, there are only 3. The 7 itself is used to calculate wins. The 2x multiplier that will double any wins it’s a part of. Finally, there’s the BAR symbols whose only purpose it is to stop a win. Do keep in mind that although there is only 1 payline, this doesn’t mean symbols always stop perfectly lined up. When a symbol halts half on the reel it also won’t count.

With its unique gameplay, the slot still has High Volatility, not necessarily covering the rate of wins but rather the size. It’s not an impossible task to get a two-of-a-kind win, the problem is getting your spins back through those wins. In my experience, my funds drained slowly over time without big enough wins to get back to the starting point.

To deal with this, the game allows players to pick a bet between £0.20 and £10 per spin. Although this can help in regulating the number of spins you can play, it doesn’t feel like it has a huge impact either. Getting a big win with a bigger bet isn’t as game-changing since £10 is one of the lower maximum bets I’ve seen in slots.

That said, it is important to keep in mind that the game offers a maximum win of 25,000x your bet. With this number, it’s possible that you walk away with a quarter of a million pounds when playing the maximum bet. All you have to do to get this jackpot is to have the 7 symbol on the screen 7 times!

Even though it’s just a tiny list, here is the full overview of different symbols in the game:

  • 7: The only paying symbol. When a 7 appears on the payline, it will add another reel that will spin too. As long as new 7s are added, new reels appear.
  • 2x Multiplier: The 2x Multiplier will double the winnings of that spin.
  • BAR: The BAR symbol has no value, it only stops the current spin immediately.


Seven 7s doesn’t have a lot of different symbols and it equally doesn’t have a lot of different features. Still, it pays to go through them as they do augment the standard gameplay a bit.

The features in the slot include:

  • Expanding Reels: Any time a 7 lands on the payline, that 7 is locked in place and another reel is added. As long a new 7s or the Multiplier symbol appear on the screen, additional reels are added.
  • Multiplier: The Multiplier will double all winnings of the current spin, and add another reel to the screen.

It won’t take anyone very long to figure out how this slot is played. There is only 1 reel with 1 payline on the screen at the start. When the reel spins and lands on a 7, that symbol is locked into place and another reel appears. Here too it is spun. If there is another 7 or the Multiplier, these too are locked into place and another reel is added. This continues as long as new 7s appear on the reels.

Since there are really only 3 symbols, you would think there is about a 1 in 3 opportunity to get a 7 on the screen, but this doesn’t take into account that a symbol can only appear halfway on the payline. In that case, it doesn’t count and the next spin is triggered.

In my experience, getting the minimal two-of-a-kind was not that difficult but the payout is only 2x your bet. Getting more 7s rapidly increases this number but is also increasingly less likely. In total, the payouts are:

  • 1 Seven: Pay-out of 2x your bet
  • 2 Sevens: Pay-out of 10x your bet
  • 3 Sevens: Pay-out of 25x your bet
  • 4 Sevens: Pay-out of 75x your bet
  • 5 Sevens: Pay-out of 250x your bet
  • 6 Sevens: Pay-out of 2,500x your bet
  • 7 Sevens: Pay-out of 25,000x your bet

In Conclusion

Seven 7’s is at first glance the most rudimentary version of the classic fruit machine but it actually diverts from its core concept quite a bit. The fact that there is only 1 paying symbol and that reels are added as the game continues are the biggest and most obvious elements of that.

The design was interesting. I didn’t really get a good grasp at what the setting was supposed to be conveying but it looked awesome and felt very appealing. It also helps in establishing that it is based on the classic fruit machine, which fits the overall style.

If you’re looking for something special but based on the classic fruit machine, maybe this game will offer you what you want. Players that prefer classic gameplay will most likely not really relate to this game and might want to skip it.

Overall rating:


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  • Features

    Wins and bets

    RTP (Return to Player):96.6%


    Max. win:bet x 25000

    Min. bet:£0.2

    Max. bet:£10

    Progressive jackpot:

    Reels & playlines



    Non-standard layout:

    Max. lines:1

    Min. lines:1

    Win both ways:

    Other features


    Expanding reels:

    Stacked symbols:

    Colossal symbols

    Auto play:

    Turbo play:

    Quick play:

    Virtual reality:

    Bonus features

    Bonus game:

    Random bonus:

    Progressive bonus:

    Buy bonus:

    Free spins:

    Scatter symbols:

    Bonus game symbols:


    Standard wilds:

    Sticky wilds:

    Walking wilds:

    Stacked wilds:

    Random wilds:

    Multiplier wilds:



    Walking re-spins:

    Sticky re-spins:

    Cascading reels:

    Sticky wins:


    You can play Seven 7's in English, Finnish, Swedish, German and 26 other languages.

    All supported languages:
    English, Finnish, Swedish, German, French, Spanish, Italian, Russian, Croatian, Czech, Danish, Dutch, Greek, Hungarian, Latvian, Lithuanian, Polish, Norwegian, Portuguese, Romanian, Slovak, Turkish, Slovene, Korean, Japanese, Indonesian, Thai, Vietnamese, Chinese


    Seven 7's supports GBP, EUR, USD, CAD


    Release date 02/2020
    3rd newest on Crazy Tooth Studio 363rd newest on Bojoko
    RTP 96.6% 0.56% > average
    3rd highest on Crazy Tooth Studio 193rd highest on Bojoko
    Win up to 25000 x your bet
    The highest on Crazy Tooth Studio 144th highest on Bojoko
    Paylines 1 95% < average
    3rd highest on Crazy Tooth Studio 1,101st highest on Bojoko
    Min bet £0.2 per spin
    2nd lowest on Crazy Tooth Studio 625th lowest on Bojoko
    Max bet £10 per spin
    4th highest on Crazy Tooth Studio 1,151st highest on Bojoko
    Rated 0 by 0 members
    The most rated on Crazy Tooth Studio 37th most rated on Bojoko
    4 more slots listed by Crazy Tooth Studio

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    Expert's profile


    Trystan Michielsen

    Trystan Michielsen

    Trystan Michielsen is a Dutch native who started his career as a content writer for various small businesses who were interested in creating an online presence.

    When the opportunity arose to move to Malta and work in the iGaming sector, Trystan didn't hesitate to make the plunge. Here he worked as a Content and SEO specialist for different companies before moving back home.

    Now acting as a freelancer he maintains his connection with the online slot community by playing and reviewing the wide variety of videoslots that are released.

    Trystan enjoys playing the slots that offer a full experience, focusing on more than just the technical details but keeping an eye on its presentation. Graphics, music and style can create a game that's more than the sum of its parts.

    A writer at heart, putting thoughts to paper is something he's done for as long as he remembers. In his free time, he enjoys writing fiction as well as watching and reviewing movies.

    Latest reviews:
    Seven 7's cover

    Game supplier:Crazy Tooth Studio

    Release date:02/2020

    RTP (Return to player):96.6%

    Max. win:bet x 25000

    Mobile version:Yes

    User rating: 0
    Expert rating: 3.8

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