Nintendo's U.S.-based servers were attacked several weeks ago but no consumer data was stolen, the company said on Sunday.
Nintendo is the latest company to be targeted by cyber criminals in a hacking attack. In April, hackers broke into Sony Corp's servers and exposed the personal information of more than 100 million of its customers. No group has taken responsibility for that attack.
Nintendo's break-in did not affect consumers' information, the company said.
"The server contained no consumer information. The protection of our customer information is our utmost priority," Nintendo of America, the company's U.S. unit, said in an e-mailed statement.
"We constantly monitor our security," Nintendo said.