New York (CNN Business) Nintendo launched a mobile game version of its popular racing series "Mario Kart" on Wednesday, but fans eager to download the game ran into some trouble.

Some users complained on social media of issues trying to play the iOS and Android app Mario Kart Tour, which gives players a chance to race against different city backdrops, such as New York City, and lets them assume the role of favorite characters like Mario, Yoshi and Princess Peach.

Nintendo displayed an in-app notification to users who downloaded the game they may not be able to play it right away.

"The servers are experiencing heavy traffic. Your log-in request will be processed in the order it was received," the notification said.

The company did not respond to a request for comment.