Website: https://www.grandmasplayroomstl.com/
This indoor playroom opened in July 2017 and is very popular with the toddler and preschool set!
I went primarily to check it out for the blog and didn't expect my kids to like it very much because they are older. But I was pleasantly surprised that they had a blast playing here! We were there for about 90 minutes and no one had asked to leave. People were ordering Uncle Leo's Pizza next door and staying for dinner.
It costs $12 per child and $10 for siblings (adults are free). There is no time limit so you can stay and play as long as you like.
It's a good-sized space, not too big, so you can sit down anywhere and see your kids. You can't bring in outside food but they sell snacks and the pizzeria is next door.
Gated baby area
They have open play daily, plus they offer special holiday events and it's a great place for a party!