Cluster Pays Slots UK: Your 2026 Guide to Cluster Mechanics, Casinos & Strategy

August 11, 2026

Cluster Pays Slots UK: Your 2026 Guide to Cluster Mechanics, Casinos & Strategy

The Core Idea: What Exactly Are Cluster Pays Slots?

Forget paylines. Cluster pays slots ditch the fixed win lines entirely. Instead, you land groups—clusters—of identical symbols touching horizontally or vertically. The bigger the group, the bigger the payout. It’s a mechanic that first went mainstream with NetEnt’s Aloha! Cluster Pays back in 2016, but today, just about every major provider has at least one cluster title in its catalogue. By 2026, the mechanic has matured into something more volatile, more feature-packed, and far more common in UK online casinos.

Why the shift? Regular payline slots can feel restrictive. You bet on 10 or 20 lines and pray symbols land left to right. Cluster pays explode that grid. A 7×7 setup, for example, gives you 49 symbols on screen at once, and clusters form wherever they touch. Hits can cascade into multiple wins from a single spin. That creates a rhythm—fast, unpredictable, and occasionally brutal.

But don’t mistake ‘more ways’ for ‘more wins’. Cluster pays typically come with high volatility. The wins are less frequent, but when they do arrive, they can be monstrous. UK players, hardened by a market that loves both risk and regulation, have taken to these slots precisely because the payout potential looks like a proper jackpot rather than spare change. The catch? Those dry spells can drain a bankroll before the first meaningful cluster even lands.

What’s the minimum cluster size in these games?

Most cluster pays slots require a group of at least five identical symbols touching vertically or horizontally to trigger a win, though a handful demand six or even nine. The payout scales exponentially with cluster size—one extra symbol can double the prize. Always check the game rules before you spin, because that minimum number directly affects hit frequency and how long your balance survives.

How do UKGC regulations affect cluster pays slots?

The UK Gambling Commission mandates that all slot games use independently tested random number generators, and cluster pays are no exception. Additionally, auto-play and turbo spin features have been heavily restricted, and spin speeds are capped. So those cascading sequences you see—they don’t actually run any faster than a standard spin; you just feel the momentum building. The regulator also demands transparent RTP disclosures, so you’ll always know what you’re getting into before you stake a penny.

How Cluster Pays Mechanics Work Under the Hood

A typical cluster pays slot runs on a fixed grid—often 5×5, 6×6, 7×7, or 8×8. Symbols fall into positions, and instead of line payouts, the game evaluates the board for connected groups. If you’ve ever played a match-three mobile puzzle, the visual logic is similar, except here the symbols explode and new ones tumble down. That’s the cascade or avalanche feature: winning clusters vanish, existing symbols drop, and fresh ones appear to fill the gaps. The cascade repeats until no new cluster forms.

Here’s where it gets proprietary. Providers have built layered mechanics on top of the basic cluster-cascade loop. Play’n GO’s Reactoonz introduces quantum symbol meters that charge up and unleash wilds. Pragmatic Play’s Gates of Olympus—technically a scatter-pay, but often lumped with clusters—adds multiplier symbols that accrue during the tumble. NetEnt’s Aloha! uses sticky win re-spins. Each tweak changes the session tempo, and understanding that tempo is the difference between bleeding your bankroll and catching a streak.

The grid size itself shapes the experience. Smaller 5×5 grids feel tighter, clusters form quickly but rarely grow beyond 8 or 9 symbols. Larger 7×7 or 8×8 grids encourage massive clusters of 15 or 20 symbols—theoretically, up to the entire board. But with more cells come more symbol types, diluting your odds. A 7×7 game with 10 different symbols has a much lower chance of a full-screen cluster than you’d hope. The maths is unforgiving. A classic example: on a 7×7 grid, the probability of all 49 cells landing the same symbol is effectively zero even on a weighted reel. What you typically see are clusters of 10–15 symbols paying 50–200× your stake, and the occasional monster cluster during bonus rounds where multipliers stack.

Worth noting: the cascade isn’t free. Each subsequent drop uses the same RNG as the initial spin. The casino’s house edge grinds away on every iteration. So when you see a sequence of 10 cascades and a final win of 300×, remember that the game has already edge-adjusted for the extra steps. The illusion of free value is just that—an illusion.

Cluster Pays vs Paylines: An Honest Comparison

Payline slots are the baseline. You bet on a set of lines, and only symbol combos on those lines pay. Cluster pays replace that with a spatial connectivity rule. But the differences run deeper than the win condition. Here’s a breakdown:

Feature Cluster Pays Payline Slots
Win condition Groups of 5+ touching symbols Matching symbols on defined lines
Grid Fixed (e.g., 7×7), no lines Usually 5×3 with 10–50 lines
Cascades Almost always included Rare (e.g., in tumbling slots like Bonanza)
Volatility Typically high–very high Varies from low to high
Max win potential Often 5,000x–50,000x stake Usually 5,000x–20,000x, depending on game
Hit frequency Usually lower (15–25%) Can be low or medium (20–35%)
Popular examples Aloha! Cluster Pays, Reactoonz, Jammin’ Jars Starburst, Book of Dead, Rainbow Riches

Don’t let the max win figures fool you. The advertised top prize on a cluster slot is often a mathematical ultimatum: you’ll hit it once in several billion spins. Real-world sessions revolve around medium-sized wins during bonus features. And while cascades can extend playtime without extra cost, they also accelerate loss when the board doesn’t connect. It’s a double-edged mechanic that feels generous until it isn’t.

What’s the difference between cluster pays and megaways?

Megaways slots change the number of symbols on each reel with every spin, creating up to 117,649 ways to win, but they still use left-to-right paylines. Cluster pays ignore reel-based ways entirely and only care about connected symbols. The key distinction: megaways guarantee a certain number of ways; clusters guarantee nothing—you either form a group or you don’t. Both can cascade, but megaways often rely on symbol removal and new symbols dropping, while cluster cascades are intrinsic to the mechanic.

Top UK Online Casinos for Cluster Pays Slots in 2026

Most UK-licensed casinos stock a solid range of cluster games. But when you’re after specific titles, generous bonus terms, and fast withdrawals, a handful of operators stand out. Below is a curated list—all carry a UKGC licence, offer GBP deposits, and have a track record of fair play. The welcome bonuses are current as of early 2025 but always check the operator’s site for the latest offer, because the UK market shifts weekly.

Casino Welcome Bonus Key Cluster Slots Min Deposit
Bet365 Casino Deposit £10, get 50 free spins on selected slots Aloha! Cluster Pays, Vikings Go Berzerk £10
William Hill Casino 100% match up to £150 + 100 spins Reactoonz, Jammin’ Jars 2 £10
888casino No-deposit £12 bonus + up to £100 match Gates of Olympus, Solar Temple £10
LeoVegas 100% up to £100 + 50 wager-free spins Moon Princess, Finn and the Swirly Spin £10
Casumo 100% up to £50 + 20 free spins Berryburst, Cluster Kingdom £10
Mr Green 100% up to £100 + 200 spins Wild Worlds, Starclusters £10
Grosvenor Casinos Deposit £20, play with £50 Aloha! Cluster Pays, Rise of Olympus £20
Betway Casino 100% up to £250 match bonus Reactoonz 2, Diamond Tales £10
Unibet 100% up to £200 + 100 spins Jammin’ Jars, The Cluster Slide £10
Mansion Casino 100% match up to £500 Aloha! Christmas, Crystal Clans £20

Treat those bonuses like a contract. Wagering requirements—often 35× the bonus amount—can turn a shiny offer into a grind. No-deposit deals are rare and usually capped at tiny cash-outs. Free spins on cluster slots are gold though, because you’re playing the actual game without burning your own deposit. Just read the small print: maximum bet sizes during wagering, game contribution percentages (many cluster slots contribute 100%, but some don’t), and expiry windows.

Can I play cluster pays slots for free in the UK?

Yes. Every UKGC-licensed casino must offer demo or practice mode for all slots, including cluster pays. You can spin for fun without depositing a pound. However, demos won’t exactly mirror real-play RTP over short sessions—the RNG still runs, so don’t treat a free-play hot streak as a sign that the game is ‘loose’. Use demos to learn the mechanics, test volatility, and figure out which features trigger how often before you commit cash.

Can I claim a bonus specifically for cluster pays slots in the UK?

Occasionally. Some casinos offer bonus spins on a featured cluster game as part of their promotions. For example, a weekend offer might give 20 free spins on Aloha! Cluster Pays. Deposit matches are usually valid on all slots, but it’s worth checking whether cluster titles contribute fully to wagering—most do, but some high-RTP cluster games are excluded. Read the promotional terms before you opt in; a quick scan can save you from unwittingly voiding a bonus.

The Best Cluster Pays Slots You Can Play Right Now in the UK

This isn’t a ranking of payouts—that would be irresponsible—but a curated list of titles that define the genre in terms of design, innovation, and player adoption. Each one brings something distinct to the cluster table.

Aloha! Cluster Pays (NetEnt) – The grandfather. RTP 96.42%, low-to-medium volatility, and a nostalgic Tiki theme. Sticky win re-spins and a free spins mode with symbol swaps keep it relevant even in 2026. Ideal for beginners because it won’t bankrupt you in five minutes.

Reactoonz (Play’n GO) – High volatility, 7×7 grid, and a cartoon sci-fi theme. The Gargantoon mechanic builds a massive 3×3 wild that stomps across the reels. RTP hangs around 96% depending on the casino version. It’s chaotic, fast, and brutally swingy—a perfect specimen of what happens when you inject personality into math.

Jammin’ Jars (Push Gaming) – 8×8 grid, disco-fruit theme, and an RTP of 96.8%. The Rainbow Feature randomly collects adjacent symbols for a big payout, and free spins come with sticky wild multipliers. Volatility is very high, so you’ll either dance out with a profit or limp away with a story. The 8×8 board also allows for truly massive clusters—rare, but the mere possibility cranks the excitement.

Moon Princess (Play’n GO) – Anime-style 5×5 grid with character powers. Princesses clear symbols, add wilds, or trigger line wins during free spins. RTP 96.5%, high volatility. The synergy between character powers adds a tactical layer—choose wisely when you fill the charge meter, and you can chain multiple features. Get it right, and you’re looking at a cascade that won’t stop.

Gates of Olympus (Pragmatic Play) – Technically a scatter-pay, but its 6×5 grid and tumble mechanic make it cluster-adjacent. High volatility, RTP 96.5%. Multiplier symbols during the tumble sequence can stack to astronomical values. It’s the poster child for the “big win” dream sold by streamers, but the underlying math means you’ll burn through deposits faster than most.

Solar Temple (Playson) – A 7×7 Aztec-themed cluster slot with RTP 96.38%. It introduces a Mystery Drop feature that scatters wilds and multipliers after cascades. Volatility is medium-high, making it a more palatable option if you like the cluster concept but want a gentler ride. The symbol set is limited, which helps clusters form more often.

Finn and the Swirly Spin (NetEnt) – Cluster pays meets a spiral grid. Symbols move along a path, and wins trigger progressive features. RTP 96.62%, low-to-medium volatility. It’s quirky, almost hypnotic, and proves that cluster mechanics can be calm rather than chaotic. Perfect for mobile sessions when you want a slower tempo.

Berryburst (NetEnt) – A simple 5×3 grid but with cluster pays and expanding wilds. RTP 96.56%, medium volatility. It’s one of the few low-contrast cluster slots that doesn’t rely on cascades, offering instead a smooth, relaxing spin pattern that works well on mobile. The expanding wilds can cover half the board, forming massive clusters in a single spin.

Cluster Kingdom (Relax Gaming) – A 5×5 medieval-themed game with a progressive feature that unlocks additional rows and multipliers. RTP 96.1%, high volatility. It’s a lesser-known gem that deserves more attention, particularly because the expanding grid mechanic feels genuinely rewarding when it clicks. Adding rows increases the cluster ceiling without needing a bigger board.

Rise of Olympus (Play’n GO) – Another 5×5 grid, based on Greek gods. Hand of God features activate randomly on non-winning spins, clearing rows or symbols. RTP 96.5%, high volatility. It’s a direct spiritual successor to Moon Princess, with similar charge mechanics but a broader free spins structure. The three gods each bring a different board-clear, so adaptability is key.

One warning: developers optimise RTP based on the casino operator. A 96% RTP version at one site could drop to 94% at another. Always check the game’s help file before you start. It’s a habit that saves money over hundreds of sessions.

New Cluster Pays Slots on the Horizon for 2026

Slot studios aren’t slowing down. By 2026, we expect several evolutions of the cluster mechanic—some already teased in trade shows. NetEnt has hinted at a “Mega Cluster” engine that connects two adjacent grids into one massive 10×10 playfield, where clusters must span both grids to trigger super-spins. Play’n GO is rumoured to be working on a Reactoonz 3 with a persistent upgrade system that carries over between sessions, essentially adding a light RPG progression to the cluster slot formula. Pragmatic Play is filing patents for a “collection cluster” where symbol types accumulate in a side meter over multiple spins, triggering super-symbols when full. Meanwhile, smaller studios like Nolimit City are pushing the “cluster cascade plus xBet” hybrid where you can pay extra per spin to guarantee a certain number of cascades—think of it as a gentler form of feature buy, though its legality under UKGC rules remains uncertain.

What does that mean for you? Expect higher volatility, more intricate bonus rounds, and win ceilings that push towards 100,000×. But remember: those ceiling numbers are marketing. The probability attached is often 1 in a few trillion spins. The real difference in new cluster slots will be in session management tools—things like pre-set loss limits and reality-check pop-ups, driven by UKGC mandates. Love them or hate them, they’ll shape how you experience the 2026 cluster roster.

Another trend: cluster mechanics bleeding into live casino. Imagine a live game show where clusters form on a physical grid and multipliers accumulate in real time. It’s not here yet, but the technology exists. By 2026, a hybrid cluster-live title could blur the lines between RNG and human-hosted games, attracting a different audience altogether.

Do all new cluster pays slots have to follow UKGC restrictions?

Absolutely. Any slot, cluster or otherwise, offered by a UK casino must comply with the Commission’s remote technical standards. That means slower spin speeds, no autoplay that runs unattended, and clear display of session duration and spend. New cluster titles are being built with these constraints in mind, which is why you’ll see more in-game features that trigger after a minimum number of spins rather than within a timed sprint. Some developers are also incorporating mandatory cool-down periods—annoying, but it keeps the game legal in the UK.

Cluster Pays Slot Features That Actually Matter

Developers love to stuff games with buzzword-filled features. Most of them are noise. Here are the ones that tangibly impact your results:

  • Cascading/tumbling wins: The backbone of cluster pays. Each cascade gives you a free shot at extending your win. Multiplier increments often attach to cascades, so the more you chain, the higher your potential prize. Without cascades, cluster pays would feel like a static puzzle.
  • Sticky wilds: Wilds that stay on the board during cascades or free spins. In cluster games, a single well-placed sticky wild can connect two otherwise separate clusters, dramatically improving returns. In Reactoonz, a sticky wild in the center can double your win rate for a sequence.
  • Win multipliers: Many cluster slots add a global multiplier that rises with each cascade during a bonus round. Pragmatic’s Gates of Olympus can throw a 500× multiplier on a single tumble. That’s the headline-grabber, but it’s rare. More common are incremental 2× or 3× bumps per cascade.
  • Symbol transformers: Some games, like Jammin’ Jars, can transform all instances of one fruit into another, creating artificially large clusters. These are rare but devastating when they land on a board full of a single symbol type.
  • Charge/feature meters: Think Reactoonz’s Quantum Leap. Filling a meter by destroying symbols triggers a special effect—extra wilds, symbol removals, or board reshuffles. Meters add a tactical rhythm: you start to anticipate when the next charge will pop, and that can influence bet sizing (within reason—the RNG still rules). Some players swear by betting higher when the meter is nearly full, but statistically, it doesn’t matter; the RNG doesn’t ‘know’ the meter state.

Features that sound good but rarely pay off include “gamble” options (walk away; the maths is against you), “super spin” buy-ins (expensive and heavily regulated in the UK anyway), and anything that promises a “guaranteed win” after X dead spins. No algorithm owes you a payout. The house edge is always present, and fancy features are just packaging.

Is there a reliable strategy for cluster pays slots?

No strategy changes the outcome of a random number generator. That’s not cynicism; it’s physics. What you can control is bankroll management, bet sizing relative to your balance, and understanding a game’s volatility profile before you spin. For high-volatility cluster slots, a rule of thumb is to keep your bet below 1% of your session bankroll and walk away when losses hit 30%. That prevents the catastrophic tailspin these games can trigger when the board simply won’t connect. Another practical move: divide your deposit into 100-unit chunks. If you deposit £50, spin at £0.50. It won’t make you win, but it stretches the session long enough to hit a bonus round occasionally.

Do Cluster Pays Slots Pay Better? RTP, Volatility, and the Maths

Let’s kill a myth: cluster pays slots do not inherently have better RTP than payline slots. Most cluster titles from Tier-1 providers sit in the 96.0%–96.8% range—right where the rest of the market lives. The difference is in the distribution of those returns. Payline slots tend to spread wins across many small hits; cluster slots pool the payback into fewer, larger events.

Take Jammin’ Jars: its reported RTP is 96.8%, but the hit frequency is around 22%. That means 78% of spins return nothing. Compare that to something like Thunderstruck II (a payline slot) with 95.65% RTP and a hit frequency of 38%. You’ll feel richer on the payline slot after 100 spins, even though the maths says you lose almost the same proportion long-term. High volatility creates an illusion of “almost winning” because the clusters form just short of a payout so often. It’s a clever psychological trick that keeps you spinning.

From a mathematical standpoint, cluster pays slots often have higher potential maximum wins because the win multiplier can compound across multiple cascades within a single spin. A 15-symbol cluster on a 7×7 grid at a high multiplier can pay 500× your stake in one go, and if that triggers a cascade that spawns another 10-symbol cluster with an accumulated multiplier, you’re suddenly in four-figure territory. That’s the chain reaction that banner ads love to tout. But the probability of that exact sequence? Typically 0.0001% or less. The base-game grind is where most of your RTP gets paid back, in tiny dribs and drabs.

Can I trust the RTP figures displayed in cluster pays slots?

Yes, in the UK. The Gambling Commission requires operators to display the correct RTP and to have it independently verified. However, be aware that some casinos offer different RTP configurations for the same title—a 94% version versus a 96% version, for example. Always check the game’s help file, which must show the exact RTP for that casino’s configuration. If it’s missing or looks suspiciously low, walk away. Reputable UK casinos rarely mess with this, but it’s your wallet: verify before you spin.

Real Money vs Free Play: How to Approach Cluster Pays Slots

Spinning for real cash changes the psychology. Demo mode lets you experiment with bet sizes and feature rhythms risk-free—take advantage of it. When you switch to real play, start with the smallest stake the game allows, even if you have a moderate bankroll. Many cluster slots accept bets as low as £0.10 or £0.20, which gives you hundreds of spins for a £20 deposit. On a bad run, that’s the difference between a disappointing session and an empty account.

Some players chase the feature buy, but in the UK, that ability has been blocked by the regulator since 2021. You can’t purchase direct entry into free spins or features at UK casinos. All you can do is spin and wait. That’s actually a safeguard, because bonus-buy versions often have lower RTP in the base game. Patience is your only shortcut—that, and disciplined bankroll pacing.

One tactic: use free-play sessions to map out bonus-trigger frequency. Count spins between feature activations over 500 or 1000 demo spins. If the free spins round hits roughly every 150 spins at your preferred bet level, then you’ll know a £20 deposit at £0.20 per spin gives you about a 13% chance of seeing the feature before busting. That’s not a strategy; it’s expectation management, which is more valuable than any betting system.

Do cluster pays slots ever have progressive jackpots?

Rarely, but it happens. NetEnt’s Aloha! Cluster Pays once had a networked progressive variant in some markets, though it’s since been discontinued. As of 2025, most cluster slots stick to fixed max wins rather than linking to a progressive pool, primarily because the cascade mechanic conflicts with the jackpot trigger logic. A few independent studios have experimented with “cluster jackpots” that award a fixed sum for a full-screen cluster, but these are often gimmicks with tiny probabilities. If you see a cluster slot with a progressive, check whether the base-game RTP has been slashed to fund it—typically, it has.

Common Misconceptions About Cluster Pays Slots

“Cluster pays are easier to win because there are no lines.” It’s the opposite. The randomness is more complex, and the hit frequency is usually lower. The visual of a board full of touching symbols tricks your brain into seeing patterns where none exist. Casinos rely on that.

“If I increase my bet, I’ll hit the feature sooner.” Bet size has zero influence on the RNG. The game doesn’t know how much you’re wagering; it just knows to return a fixed percentage over millions of spins. Upping your stake only accelerates losses when you’re down. It’s the oldest fallacy in the book, and cluster slots exploit it beautifully because the board looks “due” after a dead streak.

“A high RTP means I’ll win more often.” RTP is a long-term average, not a session guarantee. A 96.8% RTP slot can still wipe out your deposit in 50 spins. The average only matters across millions of spins; your individual session is a lottery ticket.

Are Cluster Pays Slots Better Than Payline Slots? An Unvarnished Take

Better for what, exactly? If you want frequent small wins to stretch a deposit for hours, stick to low-volatility paylines. If you’re hunting a single, life-changing multiplier and can stomach the dead-air stretches, cluster pays deliver. They’re also far more entertaining visually—the cascading symbols, the charging meters, the sudden board explosions. In a world where slot design is half the draw, cluster games win on spectacle.

But that spectacle comes with a cost. The human brain loves patterns, and cluster pays create constant near-misses: two separate clusters of four, one symbol away from connecting. Those near-misses trigger a dopamine spike similar to actual wins, which fuels prolonged play. It’s not an accident; it’s design. The UKGC now mandates that slots cannot use misleading near-miss cues, but the natural geometry of a cluster slot can still produce them. A smart player recognises when the game is manipulating attention—and steps away.

Objectively, payline slots offer more consistent feedback and are easier to model. With cluster pays, you’re dealing with an emergent board state that changes on every cascade. That unpredictability is the appeal, but it also makes it harder to gauge when a session is turning toxic. One tip: set a hard loss limit before you open the game, and never increase your bet after a losing streak. Cluster pays don’t “owe” you anything; they’re effectively a new random board each spin. A £50 deposit can vanish in 100 spins at £0.50, or 500 spins at £0.10. That’s the only real control you have.

Do all cluster pays slots have cascading wins?

No, but they almost all do. The cascade mechanic is the natural partner of cluster pays because it fills the board after a win and can create consecutive payouts from a single spin. However, a few titles—like NetEnt’s Berryburst—use cluster pays without cascades, relying instead on expanding wilds that cover clusters. Always check the game’s paytable: if you don’t see the word “cascade” or “avalanche”, assume wins are evaluated only on the initial spin. That changes the session rhythm significantly, often leading to longer dry spells between payouts.

Why do cluster pays slots feel more addictive?

The cascade visual—symbols exploding, new ones tumbling—creates a continuous feedback loop that standard slots lack. Each cascade is essentially a free re-spin, and the chain can build tension. Combined with the near-miss clusters, the brain gets hooked on the “almost” wins. The UKGC’s restrictions on spin speeds and autoplay have dampened some of that, but the core mechanic remains highly engaging. If you find yourself unable to stop after your preset loss limit, it’s the cascade doing its job. Treat it as a design feature, not a sign that you’re about to win.

Final Thoughts: Should You Bother with Cluster Pays Slots in 2026?

By 2026, cluster pays slots will be a permanent fixture, not a gimmick. The UK market will have more of them than ever, and providers will continue to push the envelope on grid size, feature layering, and max win potential. For the player, that means a wider selection, more specialised bonuses, and better mobile optimisation—most new cluster games are built phone-first.

The smart approach is selective: pick one or two high-RTP cluster slots, learn their bonus patterns inside-out via demo play, and target casinos that give you free spins on those exact titles. Ignore the flashy “20,000ה ads—they’re statistical outliers. Focus on session value: how long does £50 last, how often does the free spins round trigger, and at what bet size does volatility become unbearable? The answers are personal, so test them yourself.

As always, gambling is a net negative by definition. The house edge is built into every spin. Use cluster pays as entertainment, not income. And when a site calls its deposit match a “gift,” remember: casinos aren’t charities—they’re businesses with a calculator and a licence. That “free” cash has probably been priced into the wagering terms a dozen times over.

Cluster pays slots are worth playing in 2026 because they’re genuinely fun, unpredictably volatile, and now present in almost every UK casino lobby. But treat them like a strong coffee: energising in small doses, ruinous if you overdo it.

Are cluster pays slots legal in the UK?

Yes, all cluster pays slots offered by UKGC-licensed casinos are completely legal. The Commission regulates the software, RTP, and fairness of every game, including cluster mechanics. As long as you play at a licensed UK operator, you’re protected by the same consumer safeguards that apply to any other slot. Just avoid unlicensed offshore sites—they may offer cluster slots without any RTP transparency or data protection.

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