Gambling terms, explained straight

Slots & Gaming Machines

Cascading reels

A cascading reels slot removes winning symbols after a payout and drops new symbols into the empty positions, so a single spin can trigger several consecutive wins.

Also called
avalanche slots, tumbling reels, cascading slots
How it works
Winning symbols are cleared, and new symbols fall into the open positions, repeating while new wins occur.3
Applies to
Reel-based slot games, including online slots and non-traditional reel formats recognised by the UK Gambling Commission.12

Key points

  • One spin can produce multiple consecutive payouts as symbols cascade repeatedly.34
  • The mechanic is used in both traditional and non-traditional reel-based slot games regulated by the UK Gambling Commission.12
  • Some games repeat the cascade process while new wins keep appearing, extending a single play sequence.3

Where this term is used

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Sources

  1. Online games design and reverse withdrawals gamblingcommission.gov.uk Defines the broader slot category that includes cascading reels games.
  2. Definitions of terms - Gambling Commission gamblingcommission.gov.uk Provides the official definition of cascading reels as a slot mechanic.
  3. Best NextGen Gaming Slots Casinos For 2026 ... wizardofodds.com Explains how cascading reels work and that they allow consecutive wins from one spin.
  4. Highest RTP Online Slots in Poland | Best Payout Games ... wizardofodds.com Supports the point that cascading reels can produce multiple payouts from a single spin.

Sources are drawn from regulators, universities and published research, and each one is labelled with what it actually is — a preprint is not called a paper. Bookmaker and affiliate pages are never cited here, because a page that sells betting is not a neutral authority on it.

Written and maintained by Ellis Warrender, writer and maintainer.

Last updated 28 July 2026. Spotted an error? Tell me and it gets fixed and logged on the corrections page.