Online slots have evolved from simple three-reel games to a wide range of...

https://thefiguremagazine.com/classic-reels-to-megaways-how-online-slots-became-more-varied/

Online slots have evolved from simple three-reel games to a wide range of options, including themed video slots, Megaways with thousands of ways to win, progressive jackpots, and Slingo hybrids