Kids Don’t Want Cash Anymore–They Want ‘Robux’

Like many parents, Greg and Selena Robleto offered to pay their kids for doing household chores. The couple quickly learned their money was no good.

The girls wanted to be paid in Robux—the online currency in videogames from Roblox Corp.—and RBLX 1.27%increase; green up pointing triangle

turned up their noses at the crinkled, paper dollars the couple was offering.

“They were handing it right back to me and saying, ‘Can you convert this to Robux?’ ” said Mr. Robleto, a 46-year-old web designer in Rockville, Md. “I don’t even need...