The long-awaited launch of Mario Kart World Tour on iOS and Android smartphones has already proved to be super popular.
Hitting the app stores on Wednesday, the game immediately became the top free iPhone app across 58 markets, reveals Sensor Tower.
With players all jumping on at the same time, servers couldn't handle all the traffic. Many received messages saying, "Your log-in request will be processed in the order it was received."
Some features are subscription only, running $4.99 a month to unlock the Gold Pass, which gives access to exclusive bonuses including the 200cc mode.