Slots Like Boomberries: The Hot Zone Grid That Doubles Its Way to x2,048
Boomberries is ELK Studios dropping a cartoon fruit village on top of one of the sharpest multiplier engines the Stockholm studio has built. The board runs six columns by seven rows with no paylines, and a win needs five or more matching berries touching each other up, down or across. RTP sits at 94.00%, which is low by UK standards and the same figure ELK has used on most of its recent grid releases. Stakes run from £0.20 to £100 a spin. What makes it worth a look is the Hot Zone system: every winning position on the grid picks up a multiplier value, that value doubles each time another win lands on the same square, and a single position can climb as high as x2,048 before the round is out. Add avalanches, Big Symbols up to four by four, three separate wild types and a bonus round where those multipliers stay put between drops, and you get a ceiling of 25,000 times your stake. Anyone searching for slots like Boomberries is usually after that compounding grid maths rather than the berries, and the shortlist further down is built on that basis.
Where to Play
18+ only. T&Cs apply. Please gamble responsibly.
How the Game Works
Reviewed by Paul StonePublished: July 2026
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A spin fills all forty two positions with berries and there is nothing to line up. Five or more of the same fruit touching each other vertically or horizontally counts as a cluster, it pays, and then it disappears. Fresh symbols avalanche down into the holes and the sequence carries on until a drop produces nothing. That much is standard for a modern cluster game. The part that is not standard is what the cleared positions leave behind.
Every square covered by a winning cluster becomes a Hot Zone. The first win marks it, and each subsequent win that lands on that same square doubles whatever value is sitting there. Two wins on one position, four wins, six wins, and the number keeps climbing on the same doubling curve until you reach x2,048 at the very top end. Because the values are tied to positions rather than to symbols, the map of hot squares slowly reshapes the board as a sequence runs. Late in a long avalanche chain you are no longer playing for the cluster, you are playing to land it on the corner of the grid that has already been doubled five times.
The art keeps things deliberately light against all that arithmetic. The reels sit in a wooden frame wrapped in vines, a pink house shaped like a bomb with a rope fuse for a chimney occupies the left of the scene, and oversized watermelons, pineapples and strawberries are scattered through the grass. Backgrounds shift from bright daylight in the base game to a starlit purple sky once the bonus takes over, and that is when the fuse on the house is burning and the windows glow. A simple trick, but it works. The soundtrack is bouncy to the point of being twee, and the volume slider gets used quickly in longer sessions.
Symbols and Paytable
There are no royals here, which is refreshing. Every paying symbol is fruit: blueberries, blackberries, green berries, oranges, watermelons, pineapples and strawberries. The pay scale is built for volume rather than for single hits. A minimum cluster of five pays somewhere between 0.1x and 1x your stake depending on which fruit it is, and the top tier of fourteen or more matching symbols pays between 10x and 100x. The premium strawberry sits at the top of that range, the humble blueberry at the bottom.
Big Symbols matter more than the paytable does. These are single blocks covering two by two, three by three or four by four positions, and they count as that many individual symbols towards a cluster. A four by four fruit alone is sixteen symbols, which drags you straight into the top pay tier and covers a huge chunk of the board with fresh Hot Zones when it clears. Reading the base game correctly means watching for a Big Symbol dropping in rather than counting berries.
Bonus Features Explained
Hot Zones and the Doubling Multipliers
This is the engine and everything else feeds it. A winning cluster leaves a multiplier value on each position it occupied. Land another win on the same square and that value doubles. The progression is x2, x4, x8 and onwards along the same line, and ELK caps a single position at x2,048. Values apply to any win that covers them, so a modest cluster landing across three heavily doubled squares can pay more than a huge cluster landing on cold ground. In the base game these values reset between spins, which is why the bonus round changes the game completely.
Hot Zone Strike, Collector and Dealer
Three random events keep the grid from stalling. Hot Zone Strike drops x2 values onto a random set of positions, or doubles what is already there, and it can fire on any drop. The Collector sweeps up every multiplier value currently in view and adds them together. The Dealer takes the opposite approach and multiplies the values sitting in one or more V shaped bands across the board. Collector and Dealer are the two events worth waiting for, because they are the only mechanics that turn a scattered set of small values into one large one.
The Three Wilds
A standard wild substitutes and nothing more. The Exploding Wild clears the symbols around it when it lands, which opens space for the avalanche and creates a fresh set of positions for a cluster to sit on. The X-Bomber Wild is the aggressive one, hitting positions across the grid and leaving multiplier values behind rather than just clearing them. All three appear as grinning berry characters, so the visual language takes a spin or two to learn.
The Bonus Game and Super Bonus
Three cherry bonus symbols anywhere on the grid trigger the round, and it opens with ten drops. Persistence is the rule that matters here. Whatever a position is carrying stays carried when the next drop lands rather than being wiped, so heat accumulates right across the round. Six drops into a good bonus you can be looking at a grid where half the positions carry a value. The Super Bonus is the enhanced version, starting you with persistent multipliers already in play rather than making you build them from nothing, and it is the route ELK expects most 25,000x wins to come through.
The X-iter Menu
ELK prices five feature buys here. Bonus Hunt at 3x the stake triples your chance of triggering on the next spin. Hot Zone Strike at 10x guarantees that event fires. Persistent multipliers, meaning a guaranteed Collector or Dealer, cost 25x. Straight entry to the Bonus Game is 100x, and the Super Bonus is 500x. British licensed casinos do not offer feature buys under Gambling Commission rules, so UK players will find the X-iter tab either missing or disabled.
Pros and Cons
Pros
- Position based multipliers that double on every repeat win give the grid a memory, which very few cluster slots bother to do
- Persistent values through the bonus round make it genuinely different to the base game rather than a longer version of it
- Big Symbols up to four by four are a clean way of reaching the top pay tier without needing a freak drop
- Collector and Dealer stop the multiplier map from becoming a spread of small useless numbers
- Bright, readable artwork with a day and night shift that actually signals which mode you are in
Cons
- 94.00% RTP is well under the UK market average and no higher configuration has been recorded anywhere
- Base clusters pay so little that the game leans almost entirely on the bonus round for its return
- Mechanically it is ELK’s own Oxygen with new artwork, so anyone who played that after its 2023 launch gets very little that is new
- Five wild and multiplier events firing at once makes the first hour genuinely hard to read
- The X-iter menu is off limits to British players, which removes the studio’s usual pressure valve for a cold session
Game Screenshot
A daytime base game board mid session. The grid is six columns wide and seven rows deep, framed in wood and wrapped in vines. A pink grinning berry marked WILD occupies the top left position of the grid, and a separate gold tile carrying a W sits in the third row, third column. Most of the screen is blue berries, purple blackberries, green berries, orange berries and striped watermelons, with the grid’s only red strawberry in the fourth row. The blue X-iter tab is parked on the left edge, an AUTO control sits top right and the round spin button bottom right. Behind the reels you can see the pink bomb shaped house on the left, its rope fuse chimney unlit in the daylight, and a large tree on the right. The status bar along the bottom reads DEMO PLAY $ 4,999.10, WIN $ 0.10 and BET $ 1.00, so this capture comes from a demo build running in US dollars.
Bonus Round Screenshot
The same village after dark, which is how the game signals the bonus. A wooden sign hanging from a lantern on the right of the reels reads 6 over 10. Two tiles marked x2 sit side by side in the sixth row. Four grinning berry wilds are live on the board, one of them glowing bright pink towards the lower left, and there is a separate gold W tile in the bottom row. Watermelons, blackberries, pineapples, oranges and blueberries fill the rest of the grid. The SUPER BONUS tab sits at the bottom left and a $500.00 button is parked at the right edge. Along the bottom the bar reads DEMO PLAY $ 4,499.10, WIN $ 4.50 and BET $ 1.00.
Demo Play
The demo sitting below is driven by the identical maths model to the cash build, so how often a spin dies and what a decent bonus actually looks like both come through accurately. Give it twenty minutes before you stake anything, mostly to train your eye on which squares are already carrying a value. The balance is the only fake thing about it.
Expert Take
Opinion has split along a predictable line. Reviewers who came to it fresh have been warm about the doubling Hot Zones and the way the bonus board fills with heat, and the 25,000x figure has drawn the usual attention. Those who played Oxygen when it launched have been noticeably cooler, because the multiplier system, the grid size, the return and the ceiling are all carried over unchanged and only the artwork is new. The 94.00% return draws criticism in almost every write up, and fairly so: on a game this reliant on one bonus round, four percentage points of house edge is a lot to carry. Volatility ratings vary between sources, with several logging it as medium to high rather than extreme, which matches sessions where small clusters keep the balance ticking over without ever threatening much.
Similar Slots to Try
Four games that pick up different threads from Boomberries, from the fruit grid to the compounding multiplier.
The obvious fruit cluster comparison, though the multiplier works differently. One wild jar carries the value and walks around the board with it rather than the board itself holding the heat.
A tighter seven by seven fruit cluster game with random multipliers dropped on winning positions. Faster, friendlier and a good deal less complicated to follow.
The same appetite for long cascading chains, with a charge meter feeding escalating wild effects instead of position multipliers. Aliens rather than berries, identical patience required.
ELK again, on the same 94.00% return and the same cluster foundation, but the progress runs through a four level snake meter rather than heat on the grid.
About the Developer
Boomberries carries every ELK marker: the X-iter buy menu, the 94.00% headline, and a mechanic that rewards sequences rather than single drops. The Stockholm studio has been shipping since 2013, first with compact five reel games driven by walking wilds, later with the collection and grid systems it is now known for. Scientific Games bought the business in December 2021 and the group became Light & Wonder shortly after, but ELK still releases under its own name with its own release calendar. Boomberries is a specific case within that catalogue: it is a reskin, taking the 6×7 grid, the persistent position multipliers, the 25,000x cap and the return from the studio’s underwater title Oxygen and dressing them in fruit. Whether that bothers you depends entirely on whether you played the original. The whole set we cover sits on our ELK Studios slots page.
The studio’s medieval cluster release, where wilds merge into larger blocks. Closest ELK title to Boomberries on structure, furthest away on tone.
Four birds sweeping symbols off a grid into a collection meter. A completely different way of building value over a sequence, and the studio’s biggest series.
An older cluster experiment from ELK with a monster attacking the grid. Rougher round the edges than the recent releases but the DNA is recognisable.
A scrapyard robot theme and one of the studio’s newest cluster builds, worth comparing for how differently ELK paces a bonus round these days.
Boomberries Key Stats
Boomberries slot information last reviewed: July 2026
| Boomberries Slot Info | |
|---|---|
| Name: | Boomberries |
| Provider: | ELK Studios |
| Developer Rank: | 27 out of 90+ ELK Studios games |
| RTP: | 94.00% flat, the one and only configuration any database returned for this title |
| RTP Category: | Medium-Low (94.00% to 95.99% band) |
| RTP Rank: | Nothing in our medium-low listings returns less than this, and a typical UK slot hands back roughly four percentage points more |
| Feature Description: | Cluster pays from 5 or more adjacent matching symbols, avalanches, position based Hot Zone multipliers that double on repeat wins up to x2,048, Hot Zone Strike, Collector and Dealer multiplier events, Big Symbols from 2×2 to 4×4, standard, Exploding and X-Bomber wilds, a 10 drop Bonus Game with persistent multipliers, a Super Bonus, and X-iter, ELK’s five level feature buy menu. |
| Feature Categories: | Fruit Themed, Cluster Pays, Avalanche Wins, Multipliers, Feature Buy, High Volatility |
| Reels: | 6 |
| Rows: | 7 |
| Paylines: | None, cluster pays from 5 or more matching symbols connected horizontally or vertically |
| Volatility: | High (several trackers log it as medium to high rather than extreme, so treat it as the demanding end of medium) |
| Volatility Rank: | Towards the gentler end of our high volatility listings, since small clusters land often even though the real return is locked in the bonus |
| Min Bet: | £0.20 |
| Max Bet: | £100 |
| Max Win: | 25,000x stake |
| Release Date: | June 2026 (sources disagree on the exact day, giving 5, 12 and 24 June) |
| Slotslike Rank: | New listing, not yet ranked among our 4,300+ games (View Top 100) |
Slots with the Same Features
Three directions to take from here, depending on which part of Boomberries you came for.
Cluster Pays Slots
Games that pay for connected groups instead of lines. The wider list is on our cluster pays page.
An Egyptian cluster game where symbol charges unlock four different destruction effects, a neater and much shorter loop than the Boomberries multiplier map.
Scatter pays rather than true clusters, but the fruit and sweets board with tumbling multiplier bombs scratches a very similar itch.
Avalanche and Cascade Slots
Boards that empty out a paid cluster and refill the gaps, so a single spin can settle up several times over. Ours are gathered on the tumble and cascade slots page.
A cascading grid with a sanity meter that unlocks staged effects as chains extend, so the pressure builds across a sequence in much the same way.
Sweets on a cascading cluster board with a lighter touch and a smaller ceiling, a sensible step down if Boomberries feels too demanding.
Fruit Theme Slots
Everything from three reel classics to modern fruit grids sits on our fruit theme slots page.
Exploding fruit again, this time from Quickspin, with durians blowing holes in a colossal symbol setup rather than seeding multipliers.
Bright fruit on a cluster style grid with a far friendlier return, aimed squarely at players who want the look without the bonus dependency.
Frequently Asked Questions
How does the bonus round work in Boomberries?
Three cherry bonus symbols anywhere on the grid start the round with ten drops. Unlike the base game, Hot Zone values survive from one drop into the next rather than being cleared, so the board keeps warming up for the whole round. The Super Bonus is the enhanced entry, opening with persistent multipliers already in play.
What is the RTP of Boomberries?
94.00%. That was the only number any database returned for this title, and nobody has logged an operator running a richer build, so there is nothing to hunt for. No title in our medium-low listings gives back less than this one, and against a typical UK slot you are surrendering roughly four extra percentage points, a gap that compounds the longer you sit there.
What is the maximum win on Boomberries?
The ceiling is 25,000 times whatever you put in. Stake the £100 maximum and that comes to £2.5 million. Reaching it means wins landing on the same squares over and over until the doubling has pushed those positions deep into four figures, and realistically that only happens inside a strong Super Bonus.
How volatile is Boomberries?
High, though sources vary and several log it as medium to high rather than extreme. Small clusters land regularly enough to keep a balance moving, but base game pays are tiny and the return is concentrated in the bonus, so expect long stretches where nothing much changes.
What are the best slots like Boomberries?
Jammin’ Jars is the closest fruit cluster match, though its multiplier travels with a wild jar rather than sitting on the grid. Fruit Party gives you the same fruit board at a faster pace, Reactoonz matches the long cascading chains, and Coba Reborn is ELK’s own cluster game on the identical 94.00% return.
Can I play Boomberries for free, and is there a demo?
Yes, there is a playable demo further up this page. It uses the identical maths model to the cash build, so the hit rate and the length of the flat patches both behave as they would for real. Nothing but the balance is fake.
Who makes Boomberries?
ELK Studios. The studio started up in Stockholm in 2013 and has sat inside Light & Wonder ever since Scientific Games closed its purchase in December 2021. Boomberries landed in June 2026, though the databases do not agree on which day.
Is Boomberries the same game as Oxygen?
Mechanically, close to it. Both run a 6×7 cluster grid at 94.00% with persistent position multipliers, a 25,000x cap and a ten drop bonus triggered by three scatters. Boomberries swaps the underwater setting for a fruit village and renames the multiplier system Hot Zones, but a player who knows Oxygen will find little genuinely new here.
Our Verdict on Boomberries
Judged on its own, Boomberries is a well built cluster slot with one genuinely good idea. Multipliers that live on grid positions and double every time a win lands on them give a sequence real shape, and watching a corner of the board heat up over five or six drops is more involving than most cascading games manage. The Super Bonus earns its price tag because that persistence is where the whole design points. Two things hold it back. The 94.00% return is low, it is fixed, and on a game leaning this hard on one bonus round it stings. And it is a reskin, so the novelty depends on whether Oxygen passed you by. If it did, this is a smart, colourful grid slot with a serious ceiling. If it did not, you already know exactly how it plays.
SlotsLike rating: 7/10
Everything above was verified in July 2026 against three separate slot databases alongside ELK’s own published information for Boomberries. Where those sources contradicted each other, on the June release day and on the volatility label, the contradiction has been left visible instead of tidied away. Individual casinos are free to run their own build, so open the in game help panel and read the return, the stake range and which features are switched on before you commit money. A published return is a theoretical average taken over millions of spins, never a forecast for your afternoon.