Stack Wild
A feature where multiple identical wild symbols appear connected in a long strip, filling several spots on a reel at once.
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
Stacked Symbol
A feature where multiple identical symbols appear connected in a long strip, filling several spots on a reel at once.
Stackways Engine
The Stackways™ engine is a unique reel mechanic where each reel can randomly display a variable number of symbols, typically ranging from 2 to 10 in the base game, which dynamically changes the number of ways to win, and can expand further in bonus rounds.
Standard Free Spins
A feature that faithfully performs only the basic free spin function.
Standard Scatter
A symbol that faithfully performs only the basic scatter function.
Standard Wild
A symbol that faithfully performs only the basic wild function.
Stepper Feature
A unique mechanic where uncollected bonus or jackpot symbols nudge down one position on the subsequent spin, offering an additional chance to trigger a bonus.
Sticky Collector
Sticky Collector is a special symbol that, upon landing, remains fixed on the reels for a predetermined number of spins or until a condition is met, continuously gathering values from other prize symbols.
Sticky Respin
A feature where designated symbols are locked in place, and respins continue as long as new matching symbols land.
Sticky Scatter
A scatter that locks in place for several spins after appearing, to help trigger the bonus.
Sticky Wild
A wild that typically appears during free spins and locks in place, remaining there until the round ends.
Sticky Win Combos
A feature where, during free spins, the symbols that contributed to a win are held in place, providing a guaranteed win on every subsequent spin.
Super Cascade Reels
An enhanced version of cascading reels where a win removes all symbols of the 'same kind' from the entire screen.
Survival Mini-Game
An interactive bonus where participants are eliminated over multiple rounds, with increasing rewards for survivors.
Symbol Attraction
A feature where a special 'magnet' or 'collect' symbol appears and pulls other specific symbols on the reels toward itself.
Symbol Collector
A powerful symbol that appears during a bonus and collects the values of all other cash symbols on the screen.