Nintendo’s upcoming Super Mario Run mobile game on iOS is expected to earn more than $71 million in worldwide gross revenue during its first month on the App Store, according to a new report. Super Mario Run mobile game is the plumber’s first official game on iOS or Android, and it’s expected to be a big win for Nintendo.

SensorTower, an analytics firm that tracks app data, said in a report published Thursday that 20 million iOS users are ready to download the game on the first day it’s released on the App Store.

Super Mario Run is free to download but Nintendo is charging $9.99 for the full version. Since “millions” of Mario fans have pre-registered to get a push notification when the game goes live, SensorTower believes that Super Mario Run will gross $71 million in its first 30 days on the App Store. This is right behind Clash Royale which made $107 million in its first month, and the $143 million for hit game Pokémon Go in the same time frame.

Super Mario Run Release Date: When Is It Coming Out?

Since Nintendo’s highly anticipated mobile game, Super Mario Run , is almost here, The game will be released for iOS devices Dec. 15. Nintendo recently put out a trailer for the game. Check it out: 

To help promote Super Mario Run , Nintendo’s Reggie Fils-Aime appeared on The Tonight Show With Jimmy Fallon on Wednesday to talk about Super Mario Run . He announced that Super Mario Run will be available on some Apple Stores starting Thursday, Dec. 8.

Nintendo’s Super Mario Run will easily reach 1 billion downloads, making the game one of the best smartphone games in history, according to one analyst.

Analyst Serkan Toto, who is often cited by The Wall Street Journal, was recently quoted saying that Super Mario Run will reach 1 billion downloads. He later said on Twitter that he was talking about the initial free download, saying it should be “easy” to reach 1 billion.