As much as I hate to say it, Roblox Studio is the way, especially seeing it has to be 3D.
It's pretty low barrier to entry thing
It's pretty low barrier to entry thing
* "Investigation: How Roblox Is Exploiting Young Game Developers": https://www.youtube.com/watch?v=_gXlauRB1EQ
* "Roblox Pressured Us to Delete Our Video. So We Dug Deeper.": https://www.youtube.com/watch?v=vTMF6xEiAaY
And it's possible to make pretty decent games with it. Like I saw FNAF on Roblox recently. If somebody told me it's a standalone game made by professionals in Unreal engine, I would have believed. It looks good.