THe most popular games from each manufacturer are listed below. The biggest names are IGT (International Game Technology), Bally, WMS Gaming and Aristocrat. Top Slots at Land-Based CasinosĪt casinos around the world you will find a vast array of games although the majority of them are from a hand full of manufacturers. So what are the most popular slots? We take a look at the most popular games at both land-based casinos and casinos online. Some games even earn a cult status and become so popular that casinos will have whole banks of the same machines. Just like any form of entertainment be it film, sport or video games some titles are more popular than others. There are thousands of different slot machines on casino floors today.