An inactive cluster of locked tiles is present on the reels. The outer tiles of the inactive cluster unlock when winning clusters are formed adjacent to it. The outer tiles are divided into 4 sectors representing the 4 seasons of the year: Spring, Summer, Autumn and Winter. Randomly during a spin, one of those sectors may become active. Break all outer tiles belonging to the active season sector to trigger its corresponding feature.

Destroying the Spring sector will reveal a random multiplier of up to 100x.

Destroying the Summer sector will release a tidal wave over the reels, transforming random non-winning tiles on the screen into the same random symbol.

Destroying the Autumn sector will cause leaves to fall over the symbols, transforming them into wilds.

Destroying the Winter sector will trigger snowballs hitting random symbols on the reels. After that, an ice crack will start from those symbols, travel over a random amount of non-winning symbols vertically or horizontally, and then transform those symbols into the symbol from which it has started. Several snowballs may hit different symbols on the reels, triggering more than one ice crack.

Break the whole Clusterbuster™ for 10 free spins. On each spin, 1-4 seasons will be active. Destroying all the tiles of the Clusterbuster™ will result in a retrigger of 7 more bonus spins.