A viral Roblox game, Grow a Garden, created by a 16-year-old, has become a surprise hit, breaking concurrent player records.

Grow a Garden, created by a 16-year-old in a few days, has shattered records for the most concurrent players of any game in ...

They're probably on Roblox, playing "Grow a Garden," which, as I typed this Thursday, had more than 2.2 million people playing — four times as many as the next most popular game.

One game in particular—the record-breaking viral gardening sim Grow a Garden —drew a peak of 21.6 million concurrent players.