The lottery that moved into the casino
Keno is older than almost everything else on a casino floor and it has never really changed. You choose some numbers. A draw happens. You compare. The version in front of you here uses a forty-number grid, lets you pick up to ten, and draws ten, and if that sounds like a lottery ticket with a shorter waiting period, it is because that is essentially what it is.
What the casino added was pace. A lottery makes you wait until Saturday. A keno casino game gives you the draw immediately and then offers you another one, and another, for as long as you are willing to keep pressing the button. The wait was the only thing protecting anybody, and the casino removed it.
The version you can play here is a free keno game with virtual coins. No account is required, no deposit exists, and the balance you build has no value outside the page it is displayed on. That makes it a decent place to look at keno honestly, because there is nothing at stake to make you defensive about what you find.