So im confused is it like a mall or just to walk and are there stores like clothing stores

It's a set of tunnels, most of them connected, that link different buildings from the underground. There are mainly restaurants and other food suppliers. Some other services can also be found in the tunnels such as hair salons. In order to find clothing stores you need to go "upstairs" to the malls that can be reached from the tunnels.

Its like a food court you would find in the mall with a couple of clothing and knick-knack stores scattered around.