I've heard rumors that many slot machines use an invisible internal bingo algorithm to determine whether they pay out, supposedly as a way around the Indian Gaming Regulatory Act.
For example, I found this on one site (with a rather clickbait looking title), and also a few other examples which claim that you will have spinning wheels and bingo running on the same machine.
One in particular makes this claim:
Whereas Class III machines operate in a independent manner, Class II machines are really just an elaborate display for the bingo games running in the background. When you hit the spin button, you enter into a game of bingo. Like real games of bingo, Class II games require at least two players. If you’re at a small casino that’s not busy, the reels may spin for an abnormally long time while it waits for someone else to join the game.
I've seen video bingo machines in casinos, but it sounds like there are standard slot machines that operate as follows:
- The gambler inserts money, pulls a lever
- Wheels start spinning
- Internally, the machine plays a game of bingo on an embedded computer
- Depending on the outcome of the internal bingo game, the wheels stop "randomly" on predetermined symbols
So far, though, I haven't been able to find any solid sources that explain or verify this. Is this picture approximately correct, and are there solid sources?