The game was a near-instant success for Girdler, who said the game hit a high-water mark that year with 10,000 people playing it at once. He chalks up the game's popularity to how customizable it is.

A Roblox creator earns up to $90,000 a month selling virtual items like $0.94 stud earrings and $1.24 fur hoods. He explains how he turned his passion for video games into cash.