Vertical Reel Shift Respin
During a free spins mode, the entire reel grid dynamically shifts down one row after each win, revealing a new row of symbols at the top and triggering a respin.
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
Base Game Bonus Symbol Addition
This feature randomly adds extra bonus symbols to the main game reels, significantly increasing the probability of triggering the bonus round.
Reel Top Feature Trigger Symbols
This feature places unique symbols above each reel, activating when matching main reel symbols land, subsequently triggering a bonus game and influencing its gameplay.
Reel Compression
A dynamic reel mechanic that aggregates all prize values on a fully filled reel into its bottom symbol, then clears the reel for subsequent respins.