It's a "Super Pet 2 Level" with a set of extensions which houses two Roborovskis.
I plan to get one more set of extensions that I'll connect to the yellow block on the left so they have more to run around in.
I've read that Robos don't need levels, but my little boy Button likes to climb onto that level, so I left it in. I'm going to buy another wheel to put on that level, as well.
There is a box at the top, yes, and the long string of tubes around the cage used to connect to it. But, Jamie and Button started to fight over who got to be in there, so I took it out of the equation. They've been much calmer in the hours since. In this pic, they're snuggled up and grooming eachother in the green tube.
I'm a first time Robo owner; forgive me and correct me if I've done something wrong! ^^; Also, I'm not sure if I've used this thread right... posting something like this is okay, right?