I searched for a list of malls in the Phoenix area with indoor play areas. The most comprehensive I could find is this one from an AZCentral archive. It's from 2007 so I don't know if it is completely accurate, but it may be a place to start. I copied the full text to the end of this post.
When I wanted to take the TLT to play, I just looked at the websites for the malls nearest my house to find which ones had play areas.
When I wanted to take the TLT to play, I just looked at the websites for the malls nearest my house to find which ones had play areas.