Roaming Wild
A wild that moves to a new 'random' position on the reels with every spin, without a set path.
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
Scatter Pay
A scatter that pays an instant prize just by appearing scattered, without triggering a bonus.
Scatter Respin
When one or more scatters short of triggering free spins, this feature locks those scatters and respins the remaining reels for a final chance.
Secondary Pattern Matrix
A secondary 3x3 matrix where "cards" from main reel symbols form patterns like rows or crosses to award fixed stake multipliers.
Selectable Free Spins
A feature that allows the player to choose the nature of their free spins (e.g., number of spins, multiplier) upon entering the bonus.
Selectable Hold & Win Modes
A bonus buy feature that allows players to select and purchase entry into one of several distinct variants of the Hold & Win bonus game, each with different costs and gameplay modifiers.
Selectable Reel/Payline Modes
A feature that allows the player to choose from multiple game modes, each with a different number of active reels and paylines, directly altering the base game configuration and bet amount.
Selectable Volatility
A feature that allows the player to adjust their play style by directly selecting the game's volatility (Low/Medium/High).
Sequential Wild Reels
A feature where a new reel turns into a 'Wild Reel' in a set sequence with each spin.
Shapeshifter Symbol
A feature where a symbol randomly transforms into a different type of special feature symbol (e.g., Collector, Payer) on every spin.
Showdown Spin
A unique two-stage free spin bonus where assets gathered in a 'collection' phase are unleashed during a final 'showdown' phase.
Smart Symbols Rotation
This AI-driven feature automatically rotates outer symbols on the reels after a spin, stopping them in the optimal position to create the best possible payout.
Special Expanding Symbol
A feature where a specific symbol, designated during free spins, expands to cover the entire reel and creates a win even when scattered.
Special Reel Set
A feature where the bonus round is played on a separate set of reels with a richer symbol configuration than the base game.
Spin Modifier
A collection of features that trigger randomly during a base spin, applying various positive effects to the reels.
Splitting Colossal Symbol
A feature where a single giant symbol 'splits' into smaller-sized symbols over multiple stages.