Cluster Slide

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  • Fun theme with great soundtrack
  • Lots of features on the go
  • Free spins round with colossal wilds
  • A bit complicated at first
  • Multiplier can be hard to trigger in base game

Cluster Slide is an online slot developed by ELK Studios. Features include cascading reels, cluster pays, colossal wilds, transforming symbols, multipliers, free spins and more. The RTP of this medium/high variance slot is 96% and its top prize is worth 10,000x.


If you ever wondered what it would be like if ELK Studios made the Reactoonz sequel, then Cluster Slide is worth a few spins. Here, we’ll go over the slots unique bonus features, including its sliding cascade mechanic, Feature Wilds and free spins round.

Theme and Graphics

Cluster Slide from ELK Studios has a very cool space theme. Strangely shaped mountains and huge, bright planets surround the reels, and there’s a very quirky soundtrack playing in the background. It’s the kind of music that you’d expect hipster aliens to listen to, and it makes for the perfect accompaniment to the gameplay in this slot.

Cluster Slide

Cluster Slide RTP and Variance

Cluster Side has an RTP (return to player) of 96%. It’s also a medium/high variance online slot with a top prize of 10,000x.

How to Win

As a cluster-based slot, wins are made by landing five or more matching symbols in a group. Cascades occur, but they’re not your everyday tumble, as the reels are on a slant which causes the symbols to slide in from the right of the screen and towards the left side of the reels. It’s a pretty cool mechanic and, while it’s not totally different to normal cascades, it’s something different and fun.

Generator and Feature Wilds

When you hit wins with wilds, you’ll charge the Generator. Once the meter is fully charged, it will add special Feature Wilds to the reels. They are:

  • Big: expands a random symbol into a 2x2 wild
  • Random: replaces 2 to 4 symbols with wilds
  • Multiplier: increases the game’s multiplier by 1x
  • Upgrading: upgrades one type of symbol into a higher-paying symbol
  • Removing: removes all instances of one type of symbol from the reels


If you generate all five Feature Wilds on a spin, then a 5x multiplier will be triggered. It will be applied to all subsequent wins.

Free Spins

In Cluster Slide, the free spins bonus is called Wild Drops and it is triggered by landing three bonus symbols on the reels. You only get 3 free spins but something special happens on each of them:

  • First Drop: random wilds are added to the reels
  • Second Drop: 2x2 wild symbols are activated in random locations
  • Third Drop: one 3x3 wild symbol is added to the game

Getting just three free spins doesn’t really sound like a great bonus, but there’s actually lots going on in this round that can make way for decent wins. Starting with wilds on each spin makes for a great jumping-off point for Feature Wilds to be triggered and the multiplier to be increased.

You can also retrigger the bonus round in Cluster Slide by landing three more bonus symbols.

Cluster Slide Slot Review

Leave it to ELK Studios to create something totally crazy and out-there in terms of both design and gameplay. This studio usually comes up with some pretty unique concepts, so we’re always surprised when ELK pulls yet another quirky slot out of the bag.

The gravity mechanic in games like Cygnus and Bompers is something you don’t get in slots from any other developers and themes like Miss Wildfire and CHI are totally unique in the slots world. So, Cluster Slide fits right in with this collection.

As a medium/high variance slot, Cluster Slide provides players with more frequent wins than you would expect from a game with a 10,000x top prize. Even when there are lulls in activity, the game has a ton of features that make it seem more interesting. The game definitely holds our attention and makes for a fun gaming experience.

The base game bonuses are great, and it’s nice that there is such a wide range of theme. Extra wilds, transforming symbols and symbol removal work together to create a fun collection of features and, when they’re all triggered on the same spin, it can make for some fantastic gameplay.

The free spins round is also entertaining. You don’t get very many spins to start with but, as is the case with the base game, you get a lot of mileage out of on spin thanks to all of the Feature Wilds.

Cluster Slide is a great example of why ELK Studios is one of our favourite developers. The game just keeps you entertained with all of its interesting bonuses, and we can see it becoming one of ELK’s top titles. 

Disclaimer: Cluster Slide trademark / license is owned by ELK Studios. This site is not endorsed by ELK Studios.

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Slot Data
Slot Name: Cluster Slide
Software: ELK Studios
RTP: 96%
Volatility: High volatility
Paylines: 8
Reels: 7
Min Bet (all lines covered): £0.20 (GBP)
Max Bet: £100 (GBP)
Top Win: 10000
Features: Wild Symbol, Scatter Symbol, Multiplier, Free Spins, Expanding Wilds, Clusters, High volatility, Cascading, Reel Modifiers, Colossal Symbols, Bonus Meter
UK Available in GB? Yes. ELK Studios have a UKGC license and are allowed to offer their games at UK licensed casinos.

Cluster Slide Slot FAQs

What is the RTP of Cluster Slide?

Cluster Slide has a payout percentage of 96%.

What is the biggest win available on Cluster Slide?

The top win available on Cluster Slide is worth 10,000x – a fairly decent max prize for a highly volatile game.

How do Feature Wilds work?

Whenever you hit a win with a wild, the Generator is charged. When it is fully charged, it adds a Feature Wild to the game and resets. Feature Wilds can transform symbols or remove symbols, and even form colossal wilds.

Is there a free spins bonus in Cluster Slide?

The free spins round in Cluster Slide is triggered by landing three bonus symbols on the reels. You get three free spins and a new type of wild is added on each one: a 1x1 wild, a 2x2 wild then a 3x3 wild.

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    Overall score: 3.8 out of 5 stars
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