Nintendo’s Miitomo racks up 1.6M downloads in its first 4 days in the U.S.

Nintendo’s mobile debut is going well.

1.6 million people downloaded the publisher’s Miitomo social platform in the U.S. alone from March 31 through April 3, according to industry-tracking firm Sensor Tower. That number includes both iOS and Android, and it doesn’t include the days Miitomo spent at the top of the download chart on both platforms through the bulk of this week. The app, which has you answering questions that your avatar will then go off to share the answers with your friends, is now dropping down the charts. Sensor Tower has Miitomo at No. 10 on iOS. You can likely attribute some of that fall to the introduction of Disney Crossy Road, which came out yesterday. But few apps are able to keep their place at the top of the charts for long, and it’s now time for Nintendo to convert its millions of mobile players into paying customers. The publisher started making mobile games because the market is worth $34.8 billion and growing, and Miitomo is its launchpad into capturing some of those revenues.