A feature where a random symbol on the grid is selected as a "Marked Target," and all symbols within a 3x3 or 5x5 area surrounding it transform to match that target symbol.

A feature where a special effect is overlaid on a regular symbol, which then awards a special bonus (e.g., free spins).

A feature where existing cash symbols clone their values onto adjacent empty positions, multiplying the total collectable prizes.

A dynamic mechanic where winning clusters merge and transform into higher-level symbols, driving continuous progression.

A feature that enhances the basic abilities of a 'Collector' symbol, changing its collection range, targets, or value.

A 'lock and key' style instant prize symbol that only pays out when a specific 'collect' symbol appears with it.

A rescue feature that randomly adds necessary winning symbols to the reels in a 'near-miss' situation.

A special symbol that, when part of a winning cluster, applies its own multiplier to other multipliers within a specific area (e.g., a V-shaped area).

Special symbols that appear after a winning cluster bursts, destroying other symbols on the grid in specific patterns (e.g., a line, adjacent symbols, or a random type) to facilitate new cascades, without acting as wilds or multipliers.

A non-wild special symbol that explodes to destroy nearby symbols while adding a multiplier value to the total win.

A feature that upgrades another 'special feature symbol' to its 'Persistent' version.

A special feature where giant symbols land on the grid and shatter into multiple individual matching symbols.

A feature where a specific symbol's size progressively increases each time a condition (e.g., collecting scatters) is met during a bonus round.

In-Bonus Symbol Addition is a feature active during bonus rounds where landing specific symbols can proactively generate and add more prize symbols to the reels.

A symbol that pays an instant prize (a set cash value or bet multiplier) just by appearing, without needing a line.

A hybrid symbol that simultaneously performs the roles of two or more core special features, like Wild and Scatter.

A feature where more than one 'Special Expanding Symbol' can be active simultaneously, typically through retriggers during free spins.

A feature where multiplier values duplicate onto empty cells and add up when overlapping, spreading across the grid.

A special symbol that, when revealed, multiplies the combined value of all other existing multiplier symbols on the grid by its own value (e.g., 2x to 10x), amplifying the total win multiplier.

A special symbol that provides a random multiplier value just by appearing on the reels.

A surprise feature where symbols appear hidden and then all transform into the same matching symbol after the spin.

A special collector symbol that moves down every spin but jumps back up to its original position if it successfully collects prizes.

A top-tier symbol in 'Hold and Respin' bonuses that repeatedly performs its special ability (collect, pay, etc.) on every single spin.

A toggleable feature allowing players to manually swap highlighted symbols on the grid after cascades or explosions, for an extra bet, to form new winning combinations.

A feature where a specific symbol that was part of a win transforms into a different random symbol immediately after the payout.

A non-wild special symbol that remains on the grid and jumps to a new random position with each spin.

A feature where a symbol randomly transforms into a different type of special feature symbol (e.g., Collector, Payer) on every spin.

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.

A feature where a specific symbol, designated during free spins, expands to cover the entire reel and creates a win even when scattered.

A feature where multiple identical symbols appear connected in a long strip, filling several spots on a reel at once.

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.

A powerful symbol that appears during a bonus and collects the values of all other cash symbols on the screen.

A symbol that transforms a specific regular symbol into another type of 'special symbol', triggering a feature chain reaction.

Adjacent cash symbols merge into a single symbol, summing their values and applying a random multiplier while freeing up grid space.

A general term for any special symbol that has the ability to actively change or enhance the 'value' or 'state' of other symbols.

A feature where a single symbol in one position is treated as two (double) or more symbols, creating longer winning combinations.

A feature that transforms low-value symbols into higher-value ones, progressively increasing the average payout potential of the reels.

A special symbol that continuously transforms into a random paying symbol at the end of every spin.

A special collector symbol that transforms into two independent collector symbols within the same cell, doubling its ability to collect rewards from bonus symbols.

A feature during Hold & Win where a random 2x2 area of instant prize symbols has its cash values boosted by an environmental effect.