Tens of millions of these games live on Roblox ’s browser—hundreds of times more titles than exist on Steam. Every day, 43 million people play those games, mostly kids.

Development is outside of the scope of this article, so for that you should visit Roblox 101: How To Make Your First Game, which details what you need to know and where to find that information.

Like YouTube, Roblox started as an online stage for young creators. As the company grows toward 100 million active daily users, contributors are making big money selling games.