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.

Technically an “experience” within the game-creation platform Roblox, it smashed its own record for concurrent users by reeling in 16.4 million active players on Saturday.