Cluster pays is a pay system in which a group of identical symbols touching each other on the grid forms a win, regardless of reels or rows. There are no paylines and no rule about starting from the left: a cluster in the bottom right corner pays the same as one in the middle.
What cluster pays is
Cluster games usually use a larger grid than a standard five-reel slot, such as 6×6, 7×7 or 8×8. After each spin or drop the game looks for groups of the same symbol connected side to side or top to bottom. Once a group reaches the minimum size, often five, it pays according to how many symbols are in it. Bigger clusters pay more, often steeply.
How it works, step by step
- You set a total stake per spin.
- The grid fills with symbols.
- The game scans for groups of matching symbols that touch horizontally or vertically. Wilds usually join any cluster next to them.
- Each group at or above the minimum size pays from the paytable.
- In most games the winning symbols are then removed and new symbols fall into the gaps, the cascading reels pattern, and the check runs again.
- The spin ends when a drop produces no new cluster.
Common variations
- Minimum size: commonly five, sometimes four or more than five.
- Cascade multipliers: a multiplier that climbs with each consecutive cascade in a spin.
- Charge meters: some games count removed symbols and trigger a feature when a meter fills, a type of persistent feature.
- Grid changes: the grid can grow, or special symbols can transform or destroy blocks of symbols.
- Related systems: pay anywhere games drop the "touching" rule entirely, so any eight or more of a symbol anywhere on screen pays.
What it does to the maths and the feel
Cluster games tend to land small clusters often, many paying less than the stake, with occasional long chains of cascades. The real weight of the return usually sits in chains and multipliers rather than single clusters. That shape is typical of medium to high volatility: the spread of results is wide even when the average is the same as any other game.
A larger grid does not mean a better game. The designer balances symbol frequencies and pay values so the overall RTP lands at the intended figure. If you want to see how a wide spread of outcomes plays out over many spins, try the volatility simulator.
Rules in Great Britain
Cluster-pays games are available on GB-licensed sites. The game design rules from 31 October 2021 apply: a minimum 2.5 seconds per game cycle, no turbo or slam stops, and no celebratory sounds or imagery for a win equal to or less than the stake. On a cluster game, a small cluster worth less than your stake is shown as what it is, a net loss on the spin. The usual stake limits apply.
Questions people ask
How many symbols make a cluster?
It depends on the game; five touching symbols is a common minimum. The paytable for each game shows the sizes that pay and how much each pays.
Do diagonal symbols count in a cluster?
In most cluster-pays games, no. Symbols must touch horizontally or vertically. A few games use different rules, so check the info screen.
Why do cluster games usually have cascades?
Removing the winning cluster and dropping new symbols in gives the grid a chance to form new clusters from the same paid spin. It suits the system, but it is a design choice, not a requirement.