With the introduction of online casinos, progressive jackpots have become even more popular. Types of 5-Line Slots. These are the typical "one-armed bandits.casino site traffic web LUCKY NUGGET CASINO Types of Slot Machines. Even though most slot machines seem to be different, there's only a few different types of slots that cover a wide range of machines. These are. Gamblers still see spinning reels, but the mechanism is now powered by a microcomputer called a random number generator. Additional features have become commonplace, and dozens of different types of slot machines have become available. The collocation “ slot machine ” derives from the English word “ slot ”, meaning a hole where people drop coins to start the game. Let’s have a look at main types of existing slots, their peculiarities and functionality.