How cluster pays works
Cluster pays works by paying for groups of matching symbols that touch each other horizontally or vertically on a grid, rather than lines across reels. Most games need five or more connected symbols, the payout grows with the size of the group, and winning clusters usually vanish so new symbols can drop in and form more wins from the same stake.
By the Best Slots UK team. Last checked .
Key takeaways
- A cluster is a group of identical symbols joined edge to edge; diagonal contact usually doesn't count.
- Minimum sizes vary: 5+ is common, NetEnt's Aloha! Cluster Pays needs 9+, Relax's TNT Tumble pays from 3.
- Pay rises with cluster size, so the paytable lists bands such as 5, 6, 7… up to 15 or more.
- Cascades let one paid spin create a chain of clusters, which is where most cluster games build their wins.
- Pay anywhere (scatter pays) is different: symbols don't need to touch at all.
- Win rule
- Matching symbols touching edge to edge
- Common minimum
- 5 symbols
- Typical grids
- 6 × 5, 7 × 7, 8 × 8
- Usual companion
- Cascading or tumbling symbols
- Paylines
- None
How cluster pays works: the core rule
Instead of reels and paylines, a cluster pays game drops symbols into a grid. After each drop, the game looks for groups of the same symbol where each one shares an edge with at least one other in the group. Up, down, left and right all count; corners touching diagonally normally don't. If a group meets the minimum size, it pays according to how many symbols it contains.
Here's a simplified 5 × 5 grid. Six of the A symbols form one cluster, joined edge to edge: two in row two, one in row three and three in row four, all linked through column two. The A in the bottom-right corner only touches the group diagonally, so it isn't part of it.
| Col 1 | Col 2 | Col 3 | Col 4 | Col 5 | |
|---|---|---|---|---|---|
| Row 1 | C | B | D | C | B |
| Row 2 | B | A | A | D | C |
| Row 3 | D | A | C | B | D |
| Row 4 | C | A | A | A | B |
| Row 5 | B | D | C | B | A |
If the game's minimum is five, this pays as a six-symbol cluster. If it were nine, as in Aloha! Cluster Pays, it wouldn't pay at all.
Cluster sizes and how the paytable scales
Cluster paytables list a payout for each size band, usually from the minimum up to a top band such as 15+ or 25+. Larger clusters pay disproportionately more, because they're far rarer. A typical shape for one premium symbol might look like this (illustrative values, per £1 stake):
| Cluster size | Pays (× stake) | On a 50p stake |
|---|---|---|
| 5 | 0.5x | £0.25 |
| 6 | 0.8x | £0.40 |
| 7 | 1.2x | £0.60 |
| 8 | 2x | £1.00 |
| 10 | 5x | £2.50 |
| 15+ | 50x | £25.00 |
Low-value symbols follow the same pattern from a lower base. Always read the real figures in the game's paytable, because the steepness of that curve is a big part of the game's volatility.
Cascades: why one spin can pay several times
Almost every cluster game pairs the mechanic with cascading reels, sometimes called tumbles or avalanches. Winning clusters are removed, the remaining symbols fall, and new ones drop in from above. If those form a fresh cluster, it pays too, and the process repeats until no cluster remains. Only the first drop costs a stake.
A worked cascade chain at 50p
- First drop: a five-symbol cluster of a low symbol pays 0.2x, so £0.10.
- Those five disappear; new symbols fall in and form a seven-symbol cluster of a mid symbol paying 0.6x, £0.30.
- That clears; the refill creates a nine-symbol cluster of a premium paying 3x, £1.50.
- Nothing new connects, so the sequence ends with a total of £1.90 from one 50p spin.
Many spins stop after one small cluster or produce nothing at all; the chain above is a good outcome, not a typical one. Our guide on how cascading reels work explains the refill logic in more depth.
Multipliers, splits and other cluster modifiers
Because cascades already create repeat wins, cluster games often add modifiers that reward long chains:
- Multiplier spots: in games like Sugar Rush, positions where wins occur are marked, and further wins on those spots carry growing multipliers.
- Collect meters: clearing symbols charges a meter that releases a feature, as in Reactoonz.
- Wandering wilds: Jammin' Jars uses jar wilds that carry multipliers, which grow as the jars take part in wins.
- Splitting symbols: Big Time Gaming's Megaclusters, used in Star Clusters Megaclusters, splits a symbol into smaller ones after a win, growing the grid.
- Different grid shapes: Honey Rush uses a hexagonal grid of 37 cells, where each cell has six neighbours instead of four.
Each of these pushes value towards long, lucky sequences, which is why most cluster games in our data are rated high volatility. The multiplier entry covers how multipliers stack.
Cluster pays slots compared
| Slot | Developer | Grid | Minimum cluster | RTP | Volatility | Max win |
|---|---|---|---|---|---|---|
| Aloha! Cluster Pays | NetEnt | 6 × 5 | 9 | 96.42% (top version) | Not listed | Not listed |
| Gemix | Play'n GO | 7 × 7 | 5 | 96.83% | Medium | Not listed |
| Reactoonz | Play'n GO | 7 × 7 | 5 | 96.51% | High | 4,570x |
| Sugar Rush | Pragmatic Play | 7 × 7 | 5 | 96.50% | High | 5,000x |
| Fruit Party | Pragmatic Play | 7 × 7 | 5 | 96.47% | High | 5,000× stake |
| Rocket Reels | Hacksaw Gaming | 7 × 7 | 5 | 96.3% | High | 10,000x stake |
| Jammin' Jars | Push Gaming | 8 × 8 | 5 | 96.83% | High | 20,000x |
| TNT Tumble | Relax Gaming | 5 × 4, expanding to 5 × 7 | 3 | 96.11% | Medium–high | Not listed |
The range of minimums is worth noticing. A game paying from three symbols will pay far more often, with smaller amounts per cluster, than one that needs nine. For more titles, see our cluster pays slots hub.
Cluster pays vs pay anywhere: not the same thing
Games like Sweet Bonanza and Gates of Olympus also use grids and tumbles, so they're often lumped in with cluster games. They work differently: they pay for eight or more matching symbols anywhere on the screen, touching or not. That's pay anywhere, also called scatter pays.
| Cluster pays | Pay anywhere | |
|---|---|---|
| Symbols must touch? | Yes, edge to edge | No |
| Typical minimum | 5 (sometimes 3 or 9) | 8 |
| Shape of win matters? | Yes, a scattered set doesn't pay | No, only the count matters |
| Example | Reactoonz, Jammin' Jars | Sweet Bonanza, Gates of Olympus |
Our pay anywhere slots hub covers that side, and Reactoonz vs Jammin' Jars compares two well-known cluster games directly.
Where cluster pays came from
Match-and-clear puzzle games had made grids familiar long before they reached slots. In online slots, Play'n GO's Gemix (2014 in our data) used a 7 × 7 grid with clusters of five, and NetEnt's Aloha! Cluster Pays (2016) brought the cluster pays name to a mainstream 6 × 5 layout. Since then, 7 × 7 and 8 × 8 grids with five-symbol minimums have become the most common format.
Reading a cluster game before you play
- Check the grid size and minimum cluster in the info screen.
- Read the top band of the paytable: how big must a cluster be for the highest pay?
- Find out what persists between cascades (multipliers, meters, wilds) and whether it resets each spin.
- Note the RTP version actually in use and the max win.
- If you want to see how often clusters form, try the demo after age verification, remembering short runs prove little.
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Frequently asked questions
Do diagonal symbols count in cluster pays?
In most cluster pays slots, no. Symbols must touch edge to edge, horizontally or vertically, to join a cluster; a symbol touching only at a corner is left out. Hexagonal grids such as Honey Rush are the exception in shape, since each cell has six edge neighbours. The info screen states the adjacency rule for each game. Our cluster pays glossary entry gives the short definition, and the cluster pays slots hub lists games that use it.
How many symbols make a cluster?
Five is the most common minimum, used by Reactoonz, Sugar Rush, Jammin' Jars and many other grid slots. Some games differ: NetEnt's Aloha! Cluster Pays needs nine, while Relax Gaming's TNT Tumble pays from three. The minimum has a big effect on how the game feels, since lower thresholds produce more frequent, smaller wins. Payouts then rise by cluster size up to a top band. Check the paytable before playing. See our reviews of Aloha! Cluster Pays and TNT Tumble.
Is Sweet Bonanza a cluster pays slot?
No, Sweet Bonanza is a pay anywhere slot, also called scatter pays. It pays for eight or more matching symbols anywhere on its 6 × 5 grid, and they don't need to touch. Cluster pays games require symbols to connect edge to edge. Both systems use tumbling symbols, which is why they're often confused. Our verified data lists Sweet Bonanza at 96.48% RTP with a 21,100x max win. Read our Sweet Bonanza review and the pay anywhere entry for more.
Do cluster pays slots have a better RTP?
Not as a rule. Cluster games in our verified data range from 96.11% to 96.83%, in line with other video slots, and many come in several RTP versions, so a site may run a lower one. The win system changes how returns are delivered, not their average size. Check the live figure in each game's info screen. Our guides on how to find a slot's RTP and high RTP slots help you compare.
Why do cluster slots feel so swingy?
Because much of their return comes from long cascade chains and modifiers such as multiplier spots, wandering wilds or meters that only fill during good sequences. Those outcomes are rare, so most spins produce one small cluster or nothing, while occasional chains pay many times the stake. That's high volatility, and most cluster games in our data are rated high. Size stakes for long quiet spells. Our guides on slot volatility and high volatility slot play explain the budgeting side.
How do cascades work with cluster pays?
After a cluster pays, its symbols are removed, everything above falls down, and new symbols drop in to fill the gaps. If the refill forms another cluster, that pays too, and the sequence continues until no new cluster forms. Only the first drop costs a stake, so one spin can produce a chain of wins. Many games add multipliers or meters that grow during the chain. Our guide on how cascading reels work and the cascading reels entry explain the details.
What was the first cluster pays slot?
NetEnt's Aloha! Cluster Pays, released in 2016, is the game that popularised the cluster pays name, using a 6 × 5 grid and clusters of nine or more. Earlier grid games already paid for connected groups, including Play'n GO's Gemix, which our data lists as a 2014 release with five-symbol clusters on a 7 × 7 grid. Since then, cluster pays has become a standard format across many studios. See our reviews of Aloha! Cluster Pays and Gemix.
Are cluster pays slots good for beginners?
They're easy to follow once you know that touching groups pay, but their high volatility can make sessions uneven, which matters more than the rules. A beginner may prefer to try a cluster game in demo mode first, after age verification, to see how often clusters form and how cascades and modifiers behave. Choose a stake that leaves room for plenty of spins. Our slots for beginners guide and demo mode testing guide cover the basics.