Pachinko in Japan is basically what slot machines are here, and they are arranged in a similar manner with similar degrees of design audacity. Most of them also have a slot machine built into them, which spins its reels (digitally, they’re all screens now) whenever you land a ball in a pocket or whatever. You get a fixed payout for landing a ball in a pocket, but you can also theoretically win a jackpot by winning at the slot machine aspect. So think of it like a slot machine that has a luck check before you can even pull the lever, and then another luck check to see if you actually win. Gamblers are already famously bad at understanding statistics, but I guarantee you practically nobody can accurately assess the risk vs. reward of that. It’s diabolical, but apparently also very effective.

For what it’s worth, I have an “old” Metal Army pachinko machine from circa 1998 and even mine has a color LCD screen slot machine reel in the middle of the playfield.

While we’re at it, even my dinky Metal Army machine is quite possibly the single loudest mechanical object ever manufactured in the history of mankind, and that’s when there’s only one of them. A ball bearing factory in full production during a tornado is probably quieter than a pachinko parlor at prime time.