In just under two months, a Roblox user-created game called Grow a Garden has become a massive hit.

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.

Following the launch of its 1.07.0 update, Grow a Garden had nearly eight million active players, which is more than the top 100 Steam games combined.

Whether it serves as a chill escape from the onslaught of the real world or simply a way to beat vacation doldrums, a viral ...