Wild
A symbol that substitutes for other symbols to complete winning combinations. There are many variations, such as expanding, sticky and multiplier wilds.
Scatter
A symbol that triggers bonuses such as free spins when enough of them land, regardless of position.
Free Spins
A bonus round that spins automatically a set number of times without deducting your bet. Extra rules such as accumulating multipliers often apply.
Tumble / Cascade
Winning symbols disappear and new ones drop from above, allowing chain wins within a single spin.
Multiplier
A multiplier applied to your winnings. In many games it accumulates and grows during free spins.
Hold & Win
Triggered when enough bonus symbols land; respins reset every time a new bonus symbol appears. The more of the screen you fill, the bigger the reward, and jackpots are often attached.
Bonus Buy
A feature that lets you pay a set amount to enter a bonus such as free spins directly. It may not be offered in some countries or by some operators.