Learn to separate a casino game’s theme, format, and features before you play....

https://elliotsinspiringblog.scriblorax.com/posts/what-does-collects-mean-in-a-slot-feature

Learn to separate a casino game’s theme, format, and features before you play. The theme sets the story, the format explains how wins work, and features add special rules. Cascading reels describe a mechanic, not a theme