Queued Symbol Activation
Queued Symbol Activation is a bonus round mechanic where special symbols are collected into a visible queue and then sequentially activated one per spin, applying their unique effects over time.
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
Random Rewards Bonus
A mini-game that determines bonus conditions or instant prizes through a random draw, without player choice.
Random Symbol Multiplier
A surprise feature where a random multiplier is applied to a standard winning symbol, turning an ordinary win into a high-paying one.
Random Trigger
Any type of bonus entry method that is triggered completely at random during gameplay, rather than by a specific symbol combination.
Random Wild
A surprise wild that is randomly added to the reels during a spin to create a win out of nothing.
Reel Expansion
A feature where the physical size of the game grid (reels or rows) actually gets bigger, usually during a bonus round.
Reel Lock
A strategic respin feature where you pay an extra cost to 'lock' specific reels and hold them for the next spin.
Reel Multiplier
A feature where a multiplier is attached to an entire reel (column) and is applied to all wins that pass through that reel.
Reel Nudge for Matching Symbols
A mechanic where specific reels automatically nudge until they display matching symbols, often to complete a winning combination or trigger a jackpot.
Reel Riser Mechanic
A bonus game mechanic where new symbols ascend to starting positions and existing symbols are pushed higher on the reels.
Reel Shift Respin
A respin method where, after a win, the entire reel set shifts one position sideways, and a new reel appears in the empty space.
Reel Split
A feature that splits all symbols on a specific reel in two, doubling the number of Ways to Win.
Respin
A feature that respins some or all of the reels to provide an extra chance, often while holding certain symbols.
Respin Streak Trigger
A bonus feature is triggered by achieving a winning combination after a specific number of consecutive respins, rather than by landing specific scatter symbols.
Retrigger
A feature that allows you to win additional free spins while the free spins round is already in progress.
Roaming Special Symbol
A non-wild special symbol that remains on the grid and jumps to a new random position with each spin.