Bonus Overlay Symbol
A feature where a special effect is overlaid on a regular symbol, which then awards a special bonus (e.g., free spins).
Slot Features Explained and Standardized
Explore 228 mechanics identified through examination of individual games. We classify features by how they work, with explanations and interactive demos that make their similarities and differences easier to understand.
All FeaturesBonus GameFree SpinsJackpotScatterSpecial BettingSpecial ReelsSpecial SymbolsUnique PaysUnique SpinsWild
Bonus-Only Payout
A payout system where no prizes are awarded in the base game, and winnings can only be obtained by entering the bonus game.
Cascade Multiplier
A feature where the multiplier increases by +1 for each consecutive cascade (tumble) that occurs within a single spin.
Cascading Reels
A feature where winning symbols disappear and are replaced by new ones, causing chain reactions from a single spin.
Cash Symbol Cloning
A feature where existing cash symbols clone their values onto adjacent empty positions, multiplying the total collectable prizes.
Cluster Merge & Level Up
A dynamic mechanic where winning clusters merge and transform into higher-level symbols, driving continuous progression.
Cluster Pays
A payout system where wins are formed by landing a cluster of matching symbols connected horizontally or vertically, without lines.
Collection Meter
A system where a meter is filled each time the player collects specific symbols or performs certain actions.
Collector Reshuffle
A feature that forcibly moves collector symbols from their current positions to new random ones, creating new collection opportunities.
Collector Upgrade
A feature that enhances the basic abilities of a 'Collector' symbol, changing its collection range, targets, or value.
Colossal Reels
A feature where multiple reels merge to spin and stop together as one giant symbol.
Conditional All-Ways
A feature that normally follows a standard payline system, but temporarily switches to an 'All-Ways' system under specific conditions.
Conditional Instant Prize
A 'lock and key' style instant prize symbol that only pays out when a specific 'collect' symbol appears with it.
Connecting Pay Way
A payout system where wins are awarded as long as matching symbols appear on adjacent reels starting from the leftmost reel, without fixed lines.
Connecting Symbol Fill
When a selected expanding symbol appears on the same row on two different reels, all symbols on that row between those two reels transform into the selected expanding symbol.
Consolation Multiplier
A unique multiplier system where the multiplier increases on non-winning spins, rather than on winning ones.