There is some confusion for slots players when it comes to how Class II slot machines work as compared to Class III slot machines.
Class III slot machines are the ones with Random Number Generators (RNG). Think Las Vegas and Atlantic City—those kinds of slot machines, the ones with the reels. These are the slots games who’s RNG pulls an outcome to through up on the reels, essentially one reel at a time.
When it comes to Class II slots games, there is a little more going on.
On a Class II slot machine, which covers your virtual bingo machines, the RNG will randomly (of course) choose a symbol for each space on the display.
Picture the display of a five reel slots game on which the symbols are stacked three high. There are fifteen symbols on display total. What the RNG does in a Class II machine is pull an individual symbol for each space. Think of it as being like when a caller at a real bingo game pulls a ball from the machine—that is kind of like how each symbol on the display is chosen. So in the case of the aforementioned slots game, the RNG will pull fifteen symbol results, put them on a virtual card which is then displayed on the slot machine. Payouts are made based on if any winning combinations are formed.
Mainly the difference is that on a Class III slot machine the entire outcome is pulled by the RNG, while on a Class II slot machine the entire layout of the display is individually pulled, symbol by symbol.



