Since Super Mario Run’s release on December 15, there have been multiple speculation about how many downloads have been completed. The company announced today that the game, which is free to download, has been downloaded 40 million times in its first four days. There hasn’t been any clear indication of how many downloaders have been paying customers rather than the free downloads. This is what will be the most important information for would be investors. Super Mario Run is “free-to-start,”. You get the first 3 levels free then its $10 to unlock the rest of the game.

40 million in four days is a hell of an achievement, but it came with a pretty hefty marketing campaign. Apple actually let Nintendo notify its users of the release date. The app store remains plastered in Nintendo adverts.

At the time of writing this, Super Mario Run stands at the top of the iTunes “Free” and “Top Grossing” charts.

Earlier this week, a Nintendo spokesperson said the company has no plans to release any kind of downloadable content for the game. Nintendo’s share price fell immediately after Super Mario Run’s release and has continued to fall.

The game is only available for Apple iOS devices right now; it will come to Android in 2017.