Where do video games come from in this setting? The whole ice world thing suggests that there wouldn't be the infrastructure to support teams of Himehorn slave game developers. Are they generated in witches domains?
They're part of the boon left to the humans. Deep in The City there's a "library" that has all sorts of these things. They make great offerings and tend to get traded around for that reason. After hundreds of generations they've spread pretty much everywhere.