Kluster Krystals Megaclusters Slot Launch: Relax shows potential for BTG engine

Kluster Krystals Megaclusters Slot is the first release from Relax Gaming in 2021. Using the BTG Megacluster engine, players can enjoy symbol upgrades and big win multipliers. Here are all the details of the game.
Kluster Krystals Megaclusters
2021 is looking to be a strong year for slots with Relax Gaming's first launch: Kluster Krystals Megaclusters. Using BTG's new Megaclusters engine, slots enthusiasts can enjoy symbol upgrades and up to 40x multipliers. Random features and free spins create even more chances for valuable payouts.

Game Information

DeveloperRelax Gaming
Reels 5
PaylinesN/A (Megaclusters)
FeaturesSymbol Upgrades, Free Spins, Random Bonuses
Launch DateJanuary 2021

Does the Megaclusters engine have what it takes to be as popular as Megaways? Find out in our short Kluster Krystals Megaclusters review.

Special Features and Bonuses

The first licensed Megaclusters game separates itself from BTG's offerings with many innovative new features. For full details on the bonuses, read our complete guide below.

Symbol Upgrades: Upon landing a winning cluster of symbols, Kluster Krystals will upgrade surrounding symbols to the next tier. There are four levels of value: Singles, Doubles, Triples and Quads. Each upgraded symbol counts as a bigger cluster of symbols, improving your winning chances.

Symbol Upgrade

Tumble Wins: Each winning cluster will be removed from the reels - allowing new symbols to join. Continue to win for more symbol combinations.

Multipliers: Multiplier symbols can land in the base game and free spins. The symbol can land as a 1x, 2x, 3x, 4x ,5x or 10x symbol. If a multiplier lands next to a winning cluster, the multiplier will be upgraded. Each multiplier can be upgraded up to three times. Once there are no more tumble wins, the multiplier will be applied to the total win value.

Free Spins: To activate free spins, you will need to land the bonus symbol and upgrade it. Any winning clusters next to the bonus will upgrade it. Once fully activated, you will be awarded 7 free spins. Upgrade the bonus symbol in free spins to receive 4 additional spins.

In addition to the main game features - there are also three mini-features that can activate:

  • Krystal Vanish: One group of coloured symbols is removed from the game
  • Krystal Boost - All normal symbols will be upgraded
  • Krystal Cut - The feature will remove all un-upgraded single symbols

How to play

Kluster Krystals Megaclusters is a 5x5 online slot that uses a clusters pay mechanic. To win, you will need to land a cluster of 8 or more symbols. The more symbols in a cluster, the more valuable your payout. Upgraded symbols can count up to four symbols in a single space.

To start playing, launch the game and press the spin button, which will play the game at the default bet level. You can change your bets by clicking the bet menu button and choosing a stake. Once you're ready to play again, you can press the spin button.


There is an autoplay feature for advanced members, allowing you to enjoy the game with no inputs. Press the autoplay button and then choose how many spins you wish to play. You can also set a loss limit or a win limit to control your budget.

While the game is uncomplicated in its feature set, you can consult the paytable to view what the game offers fully. Press the paytable in the menu to find more information.

Kluster Krystals Megaclusters Review

The first two Megaclusters games from BTG were not the greatest demonstrations of the engine. But Kluster Krystals Megaclusters truly is a shining example of what this new gameplay system can do. With many innovative bonuses and ways to win, this slot looks like 2021's first gem.


What is the Kluster Krystals Megaclusters RTP?

The theoretical return to player of Kluster Krystals is 96.49% - this is the theoretical average over many play sessions.

Does the game have free spins?

Yes, upgrade the bonus symbol three times to activate the free spins. Here you will be awarded 7 free games - with additional re-triggers.

How much can I win on Kluster Krystals?

The maximum win value is 9,921x - the highest paying symbol in the game is the red gem fragment. Landing a cluster of 20 symbols awards up to 500x.

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