Epic Games is giving Fortnite’s content creators the keys to the kingdom. During this week’s Game Developers Conference, the developer revealed a new tool called the Unreal Editor for Fortnite (UEFN) ...

A learning process like the ones that led to the first Unreal and Gears of War, he adds. Darren Sugg, lead designer on Fortnite for about four years now, calls the game a kind of test case.

“Fortnite” was not Epic’s “first or second big hit,” he noted. That honor belongs to “Unreal Tournament,” the seminal sci-fi first-person shooter Epic released two decades ago that ...