Cluster Tumble Slot Review (Relax Gaming)

The Cluster Tumble slot is played on an 8x8 grid, and it’s a Cluster Pays game which means wins are triggered when clusters are formed by landing 4 or more identical symbols which are adjacent to each other.

Bets for this game start at 10p and go up to £50. You can use the plus and minus buttons button to adjust your bet amount. Non-UK players can utilise the Autoplay function.

The RTP rate is 96.4%, which is above the online average of 96%. The RTP increases to 96.57% when using the feature buys option, which is available to non-UK players.

You’ll find a volatility rating of 'high', and the base game hit frequency rate is 20.29%.

The maximum win is 20,000 x the bet, which means that the average win is 96.48 x the bet during the Free Spins bonus round.

When you launch the Cluster Tumble slot game, a video introduces the backstory of the adventurer couple. The woman is on a mission to find her missing husband in an undiscovered temple in Nepal. After receiving an emergency signal from the Himalayan wilderness, she abandons her current expedition and travels across the globe to launch a daring rescue.

During gameplay, the background creative depicts a room within the undiscovered temple, with a grid composed of stone blocks and ancient golden masks. When you trigger the Free Spins bonus round, you get a glimpse of the husband, who is being held captive. Scoring a big win reveals a scene with the husband and wife together, surrounded by jewels, suggesting they have a happy ending!

On the grid are several symbols which are undiscovered treasures in the temple. Below, the values are listed along with their values, the Pink Dragon is the highest value symbol:

• Blue Gemstone: Pays 0.3 to 50 x stake
• Green Gemstone: Pays 0.3 to 50 x stake
• Pink Gemstone: Pays 0.3 to 50 x stake
• Blue Aztec Chief: Pays 0.4 to 100 x stake
• Green Scarab Beetle: Pays 0.4 to 100 x stake
• Pink Dragon: Pays 1 to 2,000 x stake
• Wild: Substitutes for all of the symbols above
• Lightning: Triggers the Lightning Win feature
• Fire: Triggers the Fire Transform feature
• Scatter: 3+ triggers the Free Spins feature

Cluster Tumble Mobile

The Cluster Tumble slot uses HTML5 technology, which means that you can be assured of an enjoyable mobile gaming experience whether you're using Android or iOS. The game also plays well on tablets and desktops if you prefer to use these devices.

Cluster Tumble is packed with features so keep reading to find out all of the exciting details:

Special Stone Blocks

Certain stone blocks contain special features which are activated when there is an adjacent win.

Lightning Win: When activated, this special stone block is replaced by a target symbol, which is one of the standard symbols. When it’s applied after the following cascade, all standard symbols of the same kind as the target symbol (as well as Wild symbols) create a win, regardless of where on the board they are placed.

Fire Transform: When activated, this special stone block is replaced by a target symbol, which is one of the normal symbols. In the following cascade, 1-2 symbol kinds get transformed into the same kind as the target symbol.

Cascading Wins

You need to land 4 or more matching symbols for the cascading wins feature to be triggered, the winning symbols explode off the grid and new symbols appear from above. These cascades keep coming until there are no more winning clusters. If you remove all 64 blocks on the grid, you’ll activate the Free Spins feature, which you can read about in the next paragraph. 

Free Spins

When you land 3 Scatters, you trigger the Free Spins bonus round, or you can do this by removing all of the blocks from the grid in the base game. You receive 5 free spins for the round and if you manage to clear all of the blocks during the round you receive 3 extra free spins plus a 3x multiplier.

Every time you clear the grid, the multiplier increases by 3x, so it will be x6 for the 2nd time, x9 for the 3rd time, and 12 x for the 4th time, etc. And any Scatter that lands during Free Spins awards you 1 additional spin.

Buy Bonus

If you’re based outside of the UK, you can buy into the Free Spins round, which will cost you 100x your bet, and the RTP increases slightly up to 96.48%. Or you can buy into the Volatile Free Spins round, which will cost you 200 x the bet, and the RTP increase up to 96.57%. You will also see the multipliers doubled to 6x, 12x and 18x etc.

Cluster Tumble Slot

Rating: 4.6/5

With a 96.4% RTP, 20,000 x bet max wins, and an exciting storyline, Cluster Tumble has plenty to offer. Enjoy the free spins with increasing multipliers and the Stone Blocks feature, which includes symbol transformations.

I love an immersive game with a strong storyline, and the Cluster Tumble slot fits the bill perfectly. The story of the adventurer couple sets the game up well, and it looks superb visually. Even though they look more like social media influencers than serious pioneers but hey, it’s a game!

With 20,000 times bet max wins and a decent 96.4% RTP, it's become one of best slot games by Relax Gaming. The cascades exploding on the grid looked dramatic as they broke off into pieces and flew off the grid. And when you land winning combos, this opens up new positions on the grid which looks great and also increases your chances of wins. 

I’m a fan of Cluster Pays games and if they're your cup of tea, too read this OLBG guide to the best Cluster Pays slots. I’m giving Cluster Tumble a high score of 4.6/5 as it was fantastic. It also features highly on our list of adventure-themed online slots. 

The Cluster Tumble slot review was written by our slot game experts on the OLBG Expert team. Beginning with Jenny Mason our prime Slot reviewer who has 17+ years in online gambling, working for top UK brands. Jenny is an expert in slots and bingo. It was then verified by Chris Taylor who has written over 10,000 slot game reviews in an iGaming career spanning over 2 decades.   

Jenny Mason

- Your Bingo Guide 👍

Jenny Mason has more than 17 years of experience in the online gambling industry and has worked for some of the UK’s top betting brands. She started at OLBG in 2014 and her role involves creating great content and looking after the marketing activity. Jenny is knowledgeable in all areas of online sports betting and has an interest in slots and bingo.

Chris Taylor

- Your Slots Guide 👍

Chris Taylor is an industry veteran originally from Gibraltar. Having worked in the online gambling industry since 2004, Chris loves slots and has reviewed over 10,000 online slot games. Running a slots-focused website for 13 years, Chris is the go-to guy for everything slots-related.