Two games on Chillverse are exclusive to Pro subscribers: Chillverse_Uno and Colour Block. Either Pro tier — Orbit or Void — unlocks both games; you don't need the higher Void tier specifically just for these.
If you're on a free account, you'll still see these games in the Games hub, but they'll appear locked with an option to upgrade to Pro. Once you subscribe, they unlock immediately and behave like any other game, including using the same shared session pool as everything else.