Switch to United States?

It looks like you are currently located in United States but browsing the GB site.

Switch to United States »
Cover image
Ad Disclosure

Gem Rocks slot review

Added by Yggdrasil. Information last updated: 01/03/2021

User rating:

- (0)

Expert rating:

3.5 (1)

Game information

Game supplier: Yggdrasil

Release date:02/2018



Max. win:bet x 16384

Mobile version:Yes

Play Gem Rocks


Colossal symbols

Cascading reels

Max. lines


Max. win


Fairy tales & fantasy

Riches & luxury


User ratings (0)

Game design:



Game sounds:

Mobile gaming:


RTP (Return to player):
Max. win:
bet x 16384

Bojoko score (compared to other slots on Bojoko)
Yggdrasil score (compared to other slots of supplier)

Expert's review Trystan Michielsen

Slot tested

Gem Rocks sees the mountains themselves come to life, crumbling down onto winning paylines and creating massive cascades!

Developed by Yggdrasil, Gem Rocks was released in 2018 and adds a slot to their library that leans heavily on the cascading reels feature. Other games that use this mechanic include Play ‘n GO’s Reactoonz and Tiger and Dragon by Red Rake Gaming.

The game has a sizeable 6-reel, 4-row playing field with a massive 4,096 ways to win. As the name probably gives away, the game is based around the combination of gems and rocks. The background shows us a pile of rocks as we look at the core of the mountain. The different symbols are all gems, embedded in rock.

I liked the overall look of the slot. It’s very clean and the symbols are minimalistic and brightly coloured. As the game hinges around the cascading reels feature, it’s nice that before the new symbols drop down the gems that could become a new payline light up slightly so you know what to look for.

The game keeps things simple when it comes to the sound. Most of what you’ll hear is the sound of rocks rumbling. When there’s a winning payline there is a rather orchestral sounding tune playing which picks up if the cascading reels generate more win. These fade out quickly once the wins stop coming.


The reels are filled with simple but original symbols, all gems that seem embedded into the rock. The rocks themselves are coloured matched with the gems to make it easy to tell apart. From highest to lowest they are:

  • Red Star: Max. 200 coins with six-of-a-kind on a winning payline.
  • Yellow Moon: Max. 35 coins with six-of-a-kind on a winning payline.
  • Azure Circle: Max. 25 coins with six-of-a-kind on a winning payline.
  • Blue Triangle: Max. 25 coins with six-of-a-kind on a winning payline.
  • Grey Pyramid: Max. 20 coins with six-of-a-kind on a winning payline.
  • Green Square: Max. 20 coins with six-of-a-kind on a winning payline.
  • Purple Diamond: Max. 20 coins with six-of-a-kind on a winning payline.
  • Orange Cross: Max. 20 coins with six-of-a-kind on a winning payline.


Gem Rocks is a simple slot with not a lot of features, but they work well together to create a fun experience. The game mostly plays itself with little input required from the player. The High Volatility also means that wins are rather rare but due to the cascading reels, if we consider that a single win it can get pretty big.

The main features of this game are:

  • 4,096 Ways To Win: As long as the same symbols appear on consecutive reels from left to right this will count as a win. Having more symbols on each reel will increase the total win.
  • Cascading Reels: Whenever there is a winning payline, the symbols involved will explode and cause the remaining symbols to fall down, making room for new symbols. This can create additional wins.
  • Colossal Symbols: After 2, 5 and 9 wins in a single spin respectively a 2x2, 3x3 and 4x4 colossal symbol will appear to help and create new wins.

Because of the low number of features, the gameplay is rather simple. The 4,096 ways to win help in creating wins which cause the reels to drop down and maybe create new wins. Once that happens enough the game adds a colossal symbol and so on. The 2x2 Colossal Symbol would show up often enough, the 3x3 Symbol was rare and I didn’t get to the 4x4 symbol at all. Considering its size we can imagine that will be quite a win so I understand why it’s sparse.

Everything is presented in a clear way where the different colours associated with the symbols help a lot. Each gem lights up a bit if they’re potentially part of a win while the reels are still dropping down. I found that to be a clever little addition that helped a lot.

I thought the gameplay was solid but not very special since there was so little interaction required. In the best-case scenario, the game would play itself for up to 9 times in a row due to the cascading reels. I was glad it looked so crisp and clear, however, since that at least made it interesting to look at!

In Conclusion

Gem Rocks is a simple slot that is made to look pretty. The symbols are big and obvious with distinct colours that helped in keeping things apart. The tracker on the left kept score as the cascading reels created new wins, making it clear when a colossal symbol would appear.

I liked that the art was all original, no tired old symbols this time, and the background made sure I felt like I was dealing with rocks and gems the entire time. The ability to pick a bet between £0.10 and £50 meant I was free in deciding how risky I wanted to play it. A max. win of 16,384x your bet should appeal to everyone!

I found games with cascading reels to often resemble each other since the premise is so dominant in a slot like this. With the addition of colossal symbols, I think Gem Rocks takes a big step in setting itself apart. The Colossal Symbols also appeared organically, although they didn’t often contribute to a win.

Are you looking for a classic slot with familiar features but a modern presentation? Then you can’t really go wrong with Gem Rocks. It offers a solid albeit passive experience where you’ll spend your time looking out for a winning streak that will get you the coveted 4x4 Colossal Symbol!

Overall rating:


Play Gem Rocks for free

Browse casinos with Gem Rocks and other slots from Yggdrasil. Create an account and try the game for free before making a deposit.

  • Bet365 review »
    Play here »
    Number of games: 1300
    1st deposit bonus: 500%/£50
    +18, new UK players only, be GambleAware | Full apply
  • Unibet review »
    Play here »
    Number of games: 2030
    1st deposit bonus: 400%/£40
    +18, new UK players only, be GambleAware | Full apply
  • Features

    Wins and bets

    RTP (Return to Player):96.2%


    Max. win:bet x 16384

    Min. bet:£0.1

    Max. bet:£50

    Progressive jackpot:

    Reels & playlines



    Non-standard layout:

    Max. lines:4096

    Min. lines:4096

    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 Gem Rocks in English, Finnish, Swedish, German and 18 other languages.

    All supported languages:
    English, Finnish, Swedish, German, French, Spanish, Italian, Russian, Czech, Dutch, Greek, Hungarian, Polish, Norwegian, Portuguese, Romanian, Turkish, Korean, Japanese, Thai, Chinese


    Gem Rocks supports GBP, EUR, USD, CAD


    Release date 02/2018
    67th newest on Yggdrasil 701st newest on Bojoko
    RTP 96.2% 0.16% > average
    42nd highest on Yggdrasil 571st highest on Bojoko
    Win up to 16384 x your bet
    26th highest on Yggdrasil 214th highest on Bojoko
    Paylines 4096 20380% > average
    9th highest on Yggdrasil 98th highest on Bojoko
    Min bet £0.1 per spin
    6th lowest on Yggdrasil 191st lowest on Bojoko
    Max bet £50 per spin
    75th highest on Yggdrasil 930th highest on Bojoko
    Rated 0 by 0 members
    The most rated on Yggdrasil 37th most rated on Bojoko
    101 more slots listed by Yggdrasil

    Similar slots

    Jokerizer RTP: 98% Max. lines: 10 Volatility: High
    Tut's Twister RTP: 97.1% Max. lines: 25 Volatility: Medium

    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:
    Gem Rocks cover

    Game supplier:Yggdrasil

    Release date:02/2018

    RTP (Return to player):96.2%

    Max. win:bet x 16384

    Mobile version:Yes

    User rating: 0
    Expert rating: 3.5

    User reviews

    Help others by rating Gem Rocks

    Game design:
    Game sounds:
    Mobile gaming:

    Say "OK" to the cookies. Learn more in our privacy policy.