I'm not even sure you can get in without a kid? Not totally sure the policy, but they at least discourage adults to keep evil scary men away from the kids. Something like a Dave and Buster's is a much better adult venue.
I'm pretty sure you can go in without a kid, but it's not like the food is great.
In college we had a fraternity/sorority event at a local Chuck E. Cheese and had a blast. At a past job we used one for a "team building day", also had a blast.
At least most of my friends in their 20s/30s still seem to get a kick out of bad pizza, silly entertainment, arcade games, and skee ball.