I specifically remember playing Pinball Circus at my local mall arcade. As well as a couple of my friends remember it as well. So I don't think it's a false memory.That was limeridge mall in Hamilton Ontario. So unless it was the same one that is in Vegas. There was another prototype that made its rounds in Canadian arcades.
Supposedly only 2 were made. One is in a private collection. And always has been. The other is in the pinball hall of fame.