Gambling terms, explained straight

Slots & Gaming Machines

Cascading reels slots

Cascading reels slots are slot games where winning symbols are removed after a payout and new symbols fall into place, potentially creating further wins from the same spin.

Also called
Cascade, tumble, or avalanche mechanic
How it works
Winning symbols clear, new symbols drop in; if another win forms, the process repeats until no win is left12

Key points

  • After a winning combination is paid, the winning symbols are cleared from the reels and new symbols drop in to fill the gaps.12
  • If the new layout forms another win, the cascade can repeat within the same spin, ending only when no further winning combination is created.12

Where this term is used

Slots Cascading reels The core mechanic itself, where symbols clear and refill after a win. Slots Slot machine reels The vertical columns of symbols that spin and stop to form combinations. Slots Slot machine A gambling device that pays out based on symbol combinations on its reels. Slots Casino slots Slot machines found in casinos, both physical and online. Slots 5 reel slot machine paylines Paylines on a five-reel slot, determining winning symbol patterns. Slots Casino slots RTP list A casino slots RTP list ranks slot games by their return-to-player percentage

Sources

  1. Best NextGen Gaming Slots Casinos For 2026 ... wizardofodds.com Defines the cascading reels mechanic and explains how symbols clear and refill after a win.
  2. Highest RTP Online Slots in Poland | Best Payout Games ... wizardofodds.com Provides additional detail on the cascade process and examples of game-specific features like multipliers.

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.