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It's one of the most popular console games ever and has just been launched on mobile.

Mario Kart Tour was supposed to go live at 9am UK time on 25 September, but eager fans have been disappointed.

They've been taking to social media complaining about the hold screen not clearing and seeing the message below.

It stops people being able to play due to "heavy traffic", which could reflect the numbers of people trying to log in.

Let us know in the comments if you've had any problems.

The game has been long-awaited and has been delayed in the past due to errors.

The company explained they delayed it to improve the quality of the app as they wanted to make sure it was right, but it looks like they're still having some teething problems.