GameStop's surprise profit was driven primarily by interest earned on its $4 billion cash pile, rather than its underlying retail business.

GameStop Corp. shares fell more than 10% in after-hours trading Tuesday after the videogame retailer surprised investors with a quarterly profit, but sales dropped more than 30%.

Shares of GameStop , a widely watched meme stock, tumbled 15% on Wednesday after the video game retailer reported a bigger drop in quarterly revenue, questioning its ability to revitalize its business.