What is a cluster pays slot?
Last updated:
A cluster pays slot awards prizes for groups of matching symbols touching each other on the grid, rather than requiring them to land on specific paylines. A cluster of 5 or more matching symbols anywhere on the reels pays according to the game’s cluster pay table.
How clusters are counted
Symbols count as a cluster when they touch horizontally or vertically (not diagonally in most games). The minimum cluster size for a payout is typically 5 symbols. Larger clusters pay more, and the exact payout table shows what each cluster size returns for each symbol type.
Cascading mechanics
Cluster pays slots almost always use cascading reels, since clusters need to be removed to create space for new symbols. This creates chain-reaction potential. Symbols that don’t form clusters remain on the grid, so partial clusters can grow into paying clusters if the cascade adds matching symbols above them. Sweet Bonanza and Reactoonz are popular examples of the cluster pays format.
Ben Barber got into the gambling industry through the poker rooms of London in the early 2000s. After building up a solid grounding in casino, sports betting and poker, he made the move to Malta where he spent close to a decade writing for some of the biggest affiliate networks in the region. A few years ago he relocated to Bali, which shifted his focus toward website strategy and affiliate marketing. The casino side never really left, though. He still writes reviews, how-to guides and in-depth pieces on everything from slots and live dealer tables to crypto casinos and sweepstakes sites. His approach is fact-first: help players understand how online gambling actually works before they deposit a cent.