Slot machines used to be these massive 50-foot-tall setups on casino floors....

https://rapid-wiki.win/index.php/Why_Do_Slot_Developers_Care_About_Aspect_Ratio_So_Much%3F

Slot machines used to be these massive 50-foot-tall setups on casino floors. Now, the same games fit comfortably on a 6-inch phone screen. This shift means you can enjoy your favorite slots anywhere without the noise and crowds