Cluster Pays Slots Explained
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Cluster pays slots replace the traditional payline model with a grid-based win mechanic, where matching symbols must touch either horizontally or vertically to form a valid cluster. Unlike classic paylines, cluster pays do not rely on a pre-set number of lines. Instead, the game checks for matching symbols touching on any part of the grid to generate a win.
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The grid pairs naturally with cascades, a feature common in cluster pays slots. Winning clusters are removed and replaced by new symbols, allowing more wins to drop in from the top of each column. This process repeats until no new wins are achieved, so one initial button press can produce multiple hits.
How Cluster Wins Work
With cluster pays, matching symbols can appear anywhere on the grid and still contribute to a payout, as long as enough of them touch, either horizontally or vertically. The minimum cluster size is set by each game and shown in its paytable.
The overall payout is determined by the total number of symbols in each cluster and the specific symbol type. Wins also tend to trigger cascades in many cluster pays slots, with multiple hits building up from repeated drops of new symbols.
Why the Format Plays Differently
Cluster pays slots play differently as they use a larger grid, often with layouts such as 7x7 or 6x6, versus the traditional 5x3 reels of classic payline slots.
Because cluster pay games do not rely on specific combinations along a set number of preset lines, symbols can form wins in many shapes. And several quick wins may be possible from a single spin, if they occur. As a result, the cluster pay approach also changes the pacing and feel of each spin, often using multiple lower-pay symbols to generate frequent small wins.
Early Example from NetEnt
In 2016, NetEnt released Aloha! Cluster Pays, one of its first games to feature a "cluster pays" mechanic. Cluster pays slots define wins by symbol adjacency: if enough identical symbols touch vertically or horizontally on a grid with no paylines, a win is awarded, without concern for symbol position relative to any preset line.
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