Twin Collector
A special collector symbol that transforms into two independent collector symbols within the same cell, doubling its ability to collect rewards from bonus symbols.
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
Unlimited Retrigger
A retrigger feature with no limit on the number of times you can win additional free spins.
Value Boost
A feature during Hold & Win where a random 2x2 area of instant prize symbols has its cash values boosted by an environmental effect.
Wheel of Fortune
A bonus game where a large wheel divided into multiple segments is spun to win the prize on the segment where it stops.
Wheel Sector Removal & Expansion
An evolved Wheel of Fortune bonus where awarded sectors are removed and the remaining ones expand, increasing the odds for subsequent spins.
Wild Fusion (Hyper Wild)
A feature where individual wild symbols merge together to form a larger, more powerful "Hyper Wild" block with an attached multiplier, which then moves across the reels and later disintegrates back into individual wilds.
Wild Reel
A powerful state where an entire reel is filled with wild symbols.
Block Symbols
Block Symbols are a special type of symbol that appear in 2x2 or 3x3 formations, occupying multiple grid positions and counting as multiple individual symbols for winning combinations.
Encore Spin
Encore Spin is a special bonus spin awarded after certain Free Spins rounds, featuring additional nudging Wilds and potential for new multipliers.
Fixed Non-Rectangular Grid
This feature establishes a fixed, non-rectangular active playing grid where only specific symbol positions within a larger visual layout are active for symbol landing and win evaluation, creating a unique and static reel shape.
Guaranteed Cash Symbol Bet
Guaranteed Cash Symbol Bet is an optional betting mode that, for an increased cost, ensures at least one specified high-value cash or feature symbol will land on the reels during each spin.
Initial Fixed Bonus Symbols
This feature begins a bonus round with a predetermined number of special symbols locked into place, influencing the entire bonus session from its start.
Static Bet Multiplier
Static Bet Multiplier is a core betting system modification that applies a fixed, mandatory multiplier to all displayed bet options to calculate the total bet amount for each spin.
Feature Spin Pre-Game Mode
Feature Spin Pre-Game Mode is an introductory mini-game where matching tiered symbols determines the number of free spins awarded.
Connect & Collect
Connect & Collect is a mechanic where special symbols form a contiguous path from the leftmost reel to a specific target position, activating prizes or bonus features.
Position Activation and Merge
Winning symbols activate their positions on the reels; positions become partially activated on the first win and fully activated on the second, with adjacent fully activated positions then merging into larger blocks from 2x2 up to the full 5x6 grid.