Read game blurbs: theme is the look, format is how play works, and features...

https://charlie-wiki.win/index.php/What_Are_Cluster_Pays_and_How_Do_They_Change_Wins%3F

Read game blurbs: theme is the look, format is how play works, and features shape wins. Megaways names a format. Cascading reels and cluster pays show how wins form. Check pay rules, bonus terms, and bet limits