Explosive Wild
A wild that explodes upon landing, destroying surrounding symbols to force a chain reaction.
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
Feature in Feature
A nested structure where, when a specific feature is triggered, it leads to a deeper, new bonus feature as its result.
Feature Reel
A 'trigger reel' that spins horizontally, separate from the main grid (usually at the top), activating a special feature when its symbol matches the vertical reel below it.
Feature Upgrade
A feature that upgrades another 'special feature symbol' to its 'Persistent' version.
Fixed Jackpot
The most basic form of a jackpot, where the prize amount is predetermined and does not change.
Full Line Multiplier Summation
A Bingo-inspired feature where completing a full line of special zones sums their multipliers and applies the total to a specific position.
Full Paying Symbol Cascade
If all paying symbols are destroyed in a single cascade, the following cascade will consist entirely of a single kind of paying symbol.
Full Screen Bonus
A feature that awards an additional bonus (e.g., a multiplier) when all positions on the reels are filled with the same symbol.
Gamble Feature
A 'high-risk, high-return' betting option to double or lose your winnings through a simple mini-game.
Gateway Free Spins
A 'gateway' style of free spins where you must complete a specific mission to advance to the next, more powerful bonus stage.
Gem Block Destruction & Fill
Special Gem Blocks (e.g., Red, Blue, Green) destroy all symbols of their matching color-class on the reels, and then ensure only symbols of that same kind drop in the subsequent cascade.
Giant Symbol Break
A special feature where giant symbols land on the grid and shatter into multiple individual matching symbols.
Global Multiplier
A unified multiplier that is applied to all winnings that occur during a bonus round.
Grid Reset
A feature that removes all symbols from the grid and replaces them with a completely new set of symbols.
Grid Reshuffle
A feature that rearranges all existing symbols on the grid into new positions to create a second chance for winning combinations.
Growing Symbol
A feature where a specific symbol's size progressively increases each time a condition (e.g., collecting scatters) is met during a bonus round.