Slots Like Cluster Kingdom: Royals, Multipliers and the X-iter Menu

Cluster Kingdom sets ELK Studios’ cluster pays format on a wooden tabletop, with playing card style symbols standing in for wheat, trees, windmills, churches and castles across a 5 reel, 5 row board. Landing 5 or more matching symbols connected horizontally or vertically pays out, and winning symbols clear away to let fresh cards drop in, repeating for as long as new clusters keep forming. Multiplier Wilds boost any winning cluster they touch and stay in place until the round ends, and when two of them land next to each other their values multiply together rather than simply adding up. Landing a Princess and King side by side opens a Mini Bonus of 3 free drops, King and Queen together trigger a Regular Bonus of 6 drops, and all three royals adjacent unlock the Super Bonus, also 6 drops but with the deepest multiplier growth of the three. ELK’s X-iter menu lets players buy straight into any of these outcomes, from a 3x stake Bonus Hunt that triples the natural trigger chance up to a 500x stake Super Bonus purchase. A 94% RTP pairs with mid to high volatility here, and the biggest possible single-spin payout runs to 10,000x stake.

Where to Play

18+ only. T&Cs apply. Please gamble responsibly.

Slots Like Cluster Kingdom

ELK Studios’ own catalogue sits alongside a run of medieval and Arthurian themed slots from other developers that share the castle and knight setting here.

• Ivanhoe
  
  A medieval knight themed slot from the same studio, with its own jousting-inspired bonus mechanics rather than the cluster pays board game format found in Cluster Kingdom.
• Black River Gold
  
  A gold rush themed ELK Studios release built around its own distinct bonus structure, giving a good sense of how the developer applies its cluster and cascade instincts to an entirely different setting.
• Hit It Big
  
  A chaotic, monster-filled ELK Studios release running its own escalating feature system, a much wilder tone than the orderly castle setting here.
• Hong Kong Tower
  
  Another ELK Studios release entirely, trading the medieval castle for an East Asian tower setting but keeping a similarly ambitious feature stack.
• King Arthur
  
  A Microgaming release built entirely around the Arthurian legend, running a standard free spins structure that contrasts sharply with the cluster pays engine here.
• Avalon 2
  
  Another Microgaming title drawing on the same Arthurian legend, this one running a multi-stage bonus wheel rather than a cluster pays engine.
• Black Knight
  
  One of the older entries in the medieval knight category, running its own distinct feature set that predates the cluster pays approach used in Cluster Kingdom.
• Knights Keep
  
  A more traditional castle and knights slot leaning on a hold and win bonus, offering a much simpler alternative to the layered cluster and royal bonus system here.
• Coba Reborn
  
  A jungle temple setting from the same studio, running a Snake Progress Meter and crossing-wild multipliers rather than the royal court X-iter menu found here.
• Sumo Sumo
  
  A sumo wrestling setting from the same studio, using a walking Wild Sumo Stack and Brawl clash rather than the cluster pays and merging Multiplier Wilds used here.

How the Game Works

Reviewed by Paul Stone
Published: July 2026

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Wheat, tree, windmill, church and castle symbols make up the regular paytable, paying between 25x and 250x stake for a cluster of 20 or more. Princess, Queen and King symbols sit above them as feature symbols, alongside standard Wild and Multiplier Wild icons. The board runs 5 reels by 5 rows, and a win requires 5 or more matching symbols connected horizontally or vertically. Winning symbols clear from the grid and new cards drop in to fill the gaps, with the sequence continuing for as long as fresh clusters keep landing.

Multiplier Wilds are the game’s main scoring tool, boosting the value of any cluster they take part in and remaining locked in place until the current round finishes. When two Multiplier Wilds end up next to each other, rather than simply adding together their values multiply, so a pair of small multipliers can compound into something far larger by the time a round wraps up.

Free Drops, Sticky Redrops and the Royal Bonuses

A separate Free Drops feature can trigger during base game play, launching Sticky Redrops: one paying symbol is selected and every matching copy on the grid becomes sticky, staying locked in place while the rest of the board keeps redropping, continuing until no further matches of that symbol appear. Wilds remain active throughout the whole sequence.

Landing a Princess and King adjacent to each other opens the Mini Bonus, awarding 3 free drops with the multiplier climbing by 1 after every win. A King and Queen pairing instead triggers the Regular Bonus, running 6 free drops with multipliers carrying over between each one. Getting all three royals adjacent at once unlocks the Super Bonus, also 6 drops but with the strongest persistent multiplier growth of the three tiers. ELK’s X-iter menu offers a direct route into any of these: 3x stake for a Bonus Hunt that triples the natural trigger odds, 10x for a guaranteed Sticky Redrops, 50x for the Mini Bonus, 100x for the Regular Bonus, or 500x stake for a guaranteed Super Bonus.

Pros and Cons

Pros

• Five separate feature buy tiers give unmatched control over how a bankroll gets spent chasing the bonus
• The merging Multiplier Wild mechanic rewards paying attention to where wilds land rather than leaving everything to chance
• A 10,000x ceiling is a solid return for a mid to high volatility title
• The board game presentation and card-flip animations give Cluster Kingdom real personality
• Three distinct royal bonus tiers add genuine variety rather than one repeated free spins format

Cons

• The 94% RTP falls short of what UK players typically expect from a modern release
• The gap between Mini, Regular and Super Bonus costs on the X-iter menu is steep for casual players
• Understanding how Sticky Redrops interacts with the royal bonuses takes some getting used to
• No natural way to guarantee which royal pairing lands without paying for the X-iter menu

Game Screenshot

Three royal bonus tiers and a Sticky Redrops feature all interacting at once is a lot to take in from a paytable alone, so it is worth loading the free demo and letting a handful of rounds actually play out. Try our free demo slots to see it for yourself.

Expert Take

Reviewers have generally welcomed the merging Multiplier Wild mechanic as a genuinely satisfying twist on the usual cluster pays formula, since watching two wilds combine into a much larger figure gives big wins a real sense of build up. The five-tier X-iter menu draws more mixed comment, praised for flexibility but seen by some as needlessly complicated compared to a simple single feature buy.

About the Developer

Cluster Kingdom comes from ELK Studios, released in October 2024 and pairing the developer’s established cluster pays format with a layered, board-game inspired bonus structure. The studio has built a reputation for genuine mechanical variety across its catalogue rather than reskinning the same feature repeatedly, and the merging Multiplier Wild system here continues that pattern. See more on our ELK Studios slots page.

Cluster Kingdom Key Stats

Cluster Kingdom slot information last reviewed: July 2026

Slots with the Same Features

A couple of other directions worth exploring beyond the medieval theme itself.

More ELK Studios Slots

Two further titles from the studio, each leaning on a different combination of ELK’s usual feature building blocks.

Medieval Themed Slots

Other titles built around the same knights and castles setting.

Frequently Asked Questions

How does the cluster pays mechanic work in Cluster Kingdom?

Landing 5 or more matching symbols connected horizontally or vertically pays out, and winning symbols clear away to let new cards drop in, repeating for as long as fresh clusters form.

What do Multiplier Wilds do?

They boost the value of any winning cluster they are part of and remain locked in place until the round ends, and when two land next to each other their values multiply together rather than adding up.

How do you trigger the royal bonus tiers?

A Princess and King adjacent opens the Mini Bonus of 3 free drops, King and Queen together trigger the Regular Bonus of 6 drops, and all three royals adjacent unlock the Super Bonus, also 6 drops with the deepest multiplier growth.

What is the X-iter menu?

It lets players buy directly into a feature: 3x stake for a Bonus Hunt that triples trigger odds, 10x for a guaranteed Sticky Redrops, 50x for the Mini Bonus, 100x for the Regular Bonus, or 500x for a guaranteed Super Bonus.

What is the maximum win on Cluster Kingdom?

The game can pay out up to 10,000 times the stake.

What is the RTP of Cluster Kingdom?

Cluster Kingdom runs a single RTP of 94%, below the UK market average.

Who makes Cluster Kingdom?

ELK Studios released Cluster Kingdom in October 2024.

Our Verdict on Cluster Kingdom

Cluster Kingdom earns its place in ELK Studios’ catalogue by genuinely building on the cluster pays format rather than just reskinning it, and the merging Multiplier Wild system gives big wins a real sense of build up that flat multiplier mechanics rarely match. A below-average RTP and a steep gap between the X-iter menu’s cheapest and most expensive options will put off cautious players, but a 10,000x ceiling and three genuinely distinct royal bonus tiers make this a rewarding pick for anyone willing to learn the full system.

SlotsLike rating: 7/10