In case you haven’t seen my Hamster (or Gerbil) posts before now, I had both in high school. Shame they didn’t have this kind of cool stuff back then. I did have a ball that I could let them run around in. I used large aquariums for their living quarters and filled it various things to keep them entertained, like the squeaky wheel, the little house.
I saw this on YouTube last night – DIY – Build Amazing Hamster House With Magnetic Balls (Satisfying) – Magnet Balls – YouTube Video: https://www.youtube.com/watch?v=hpVZJY2AAFE (about 10:41 minutes long).