A type of free spins with no set number of spins, which instead ends when all of a specific 'end symbol' are collected.

A 'gateway' style of free spins where you must complete a specific mission to advance to the next, more powerful bonus stage.

A structure where a single game contains two or more distinct free spin modes, each with its own trigger and rules.

A feature that allows you to win additional free spins while the free spins round is already in progress.

A feature that allows the player to choose the nature of their free spins (e.g., number of spins, multiplier) upon entering the bonus.

A unique two-stage free spin bonus where assets gathered in a 'collection' phase are unleashed during a final 'showdown' phase.

A feature where the bonus round is played on a separate set of reels with a richer symbol configuration than the base game.

A feature that faithfully performs only the basic free spin function.

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.

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.

A retrigger feature with no limit on the number of times you can win additional free spins.