This is a place you have to visit when you're in Vegas if you in any way at all like pinball. If you don't in any way like pinball, then I'm not sure if we can be friends. Just saying.
This place has pinball games that run the gamut: the oldest things you've ever seen, the great classics you spent all your quarters on, and newer games based on mediocre action films! Games are reasonably priced and well-maintained. The owners take such pride in the games and in the fun that people have by playing them. I saw one of the owners give an extra play or two to some small kids who had bad luck and another who helped a little girl get a stuffed animal from one of those claw grab machine things.
For me, all i cared about was that they had Theatre of Magic and Attack from Mars. They actually had two Theatre of Magics and one was calibrated way better than the other. And by better, I mean in a way that allowed me to do well!!
This place is open every day, is free to get into, and has non-alcoholic drinks and popcorn to purchase. As an adult in Vegas, it's hard to have $20 go so long with such entertainment. Go here, seriously!