Since my oldest is 8 I figured that by this point I had been to or at least heard of all of the indoor play areas around me. Yesterday I found another one.
Inside of the Mt Prospect Recplex is an indoor playground. It has a climbing structure, slide and ball pit. Kids are supposed to be at least 3 and no taller than 48 inches, although I don't think anyone checks.
I took Little Man there and he loved it. We got there about 10 and ended up staying for two hours! There weren't a ton of kids there (maybe 8 at the most) even though the weather was kind of blah this morning.
It's located at 420 W Dempster in Mount Prospect and is open whenever the RecPlex is open - which on weekdays is 530am to 11pm.
The play area is not supervised. There are restrooms, vending machines and water fountains in the Recplex. Little Man had a lot of fun, and the price can't be beat for an indoor place. Best part, since it's about half way between us and Woodfield, I can use it as a reward for being good at the mall or a place to get the wiggles out before we get to the mall.