Some people rely on the theme, and others depend on their intuition. There are many criteria at play in determining which the best online slots are. We will walk you through these and more in our dedicated breakdown of the best online slot machines. Meanwhile, there are some objective criteria you can use to pick slot games. One thing everyone expects, though, is a quality product that runs smoothly on any device. There is no limit on how many games new players can find at online casino sites these days.