The definition of what actually constitutes a game—and whether Roblox specifically hosts user-created games—has been surprisingly important in the Epic Games v. Apple trial this month.

The expansive world or Roblox can be confusing for casual gamers, curious parents and aspiring developers alike, so we compiled this guide to getting started.

SAN FRANCISCO—At the Game Developers Conference Monday, Roblox rolled out a new set of AI tools designed to let the company's millions of player-creators create usable game code and in-game 2D ...