It’s no question that Fortnite is a huge hit at the moment, and its popularity is only growing. Now Fortnite fans can enjoy the battle royale shooter wherever they go with a new iOS port. Within 24 hours of the invites going out to some players, Fortnite is already the number one most downloaded game on the App Store in the United States.

The data comes from the app-tracking firm Sensor Tower, which monitors the App Store and tracks downloads for specific software and apps. Yesterday, Epic Games sent out the invites to the iOS version of Fortnite to those who signed up to participate in the early trial run of the mobile port. While this version of the game is still in development, that hasn’t stopped dedicated fans from enjoying the battle royale hit on-the-go.

While reaching the top of the app store is an impressive feat all its own, the fact that Fortnite  did it during an early preview period suggests big things for Epic Games. It's very likely that the studio sent out tons of invites to prospective players, but there are presumably even more waiting for their chance to download and play the game.

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This is the second time Fortnite has made headlines this week, as popular Twitch streamer Ninja teamed up with hip-hop artist Drake and other celebrities to take on the battle royale. The team broke yet another Twitch record during the livestream.

Following the huge success of Ninja’s stream, Epic Games announced plans to host a celebrity-filled Fortnite tournament. The Celebrity Pro-Am will feature 50 of “the world’s greatest athletes and entertainers” who will face off head-to-head alongside the 50 top Fortnite players. The tournament is set to take place at E3 2018.

In the meantime, those on the iOS test list will get to enjoy Fortnite as Epic Games continues to fine-tune the mobile version. An Android version is planned to release later this year, with no specific date set at this time.

Fortnite  is available now in early access for iOS, PC, PlayStation 4, and Xbox One, with Android support coming later in 2018.