Roblox's "Grow A Garden" game is breaking popularity records. A 16-year-old created it. How did it blow up? I tried it myself.

On Saturday, more than 16 million people were planting seeds and collecting exotic pets within Grow a Garden at the same time. Many were not yet teenagers.

Roblox stock soared 10% on Thursday after the company reported second-quarter revenue that beat expectations amid strong user growth. The gaming platform saw $1.44 billion in net bookings, up 51% ...