End-Condition Free Spin
A type of free spins with no set number of spins, which instead ends when all of a specific 'end symbol' are collected.
Free Spins
A core bonus round where you can spin the reels for free without using your balance, often with powerful extra features activated.
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Gateway Free Spins
A 'gateway' style of free spins where you must complete a specific mission to advance to the next, more powerful bonus stage.
Multi-Mode Free Spins
A structure where a single game contains two or more distinct free spin modes, each with its own trigger and rules.
Retrigger
A feature that allows you to win additional free spins while the free spins round is already in progress.
Selectable Free Spins
A feature that allows the player to choose the nature of their free spins (e.g., number of spins, multiplier) upon entering the bonus.
Showdown Spin
A unique two-stage free spin bonus where assets gathered in a 'collection' phase are unleashed during a final 'showdown' phase.
Special Reel Set
A feature where the bonus round is played on a separate set of reels with a richer symbol configuration than the base game.
Standard Free Spins
A feature that faithfully performs only the basic free spin function.
Sticky Win Combos
A feature where, during free spins, the symbols that contributed to a win are held in place, providing a guaranteed win on every subsequent spin.
Symbol Release
A feature where specific symbols are collected during a set number of spins, then released all at once on the final spin to create a big win.
Unlimited Retrigger
A retrigger feature with no limit on the number of times you can win additional free spins.
Persistent Free Spin Grid
In the bonus game, the destruction progress of the game grid (cleared blocks or empty spaces) is preserved across all free spins, with the grid not regenerating its original state between spins.