Part I: Games & Gaming · Slot Machines & Electronic Gaming

Cascading Reels

Slot Mechanics

A mechanic in which winning symbols are removed from the reel grid after paying out, and new symbols fall from above (or slide in from the side) to fill the empty positions. If the new symbols create additional winning combinations, the process repeats, potentially generating multiple consecutive wins from a single initial spin. Cascading reels are frequently paired with increasing multipliers (each successive cascade increases the win multiplier) and cluster-pays formats. This mechanic significantly increases hit frequency and perceived player value, as a single wager can produce extended play sequences.

In practice

NetEnt’s “Gonzo’s Quest” popularized the “Avalanche” cascading mechanic. Different manufacturers use different branded names for the same underlying concept.

One entry from the Casino Industry Glossary — 1,157 terms written for surveillance, compliance and operations professionals rather than for players. Definitions describe industry usage; where a term carries a regulatory meaning, verify against the instrument that governs your jurisdiction.