Mobile hit Pokémon Go had its highest revenue in a day since its viral launch last July, according to market analyst Sensor Tower. It’s all thanks to Legendary Pokémon.

Players spent around $5.8 million on July 23 on iOS and Android, when developer Niantic debuted Articuno and Lugia, two of five highly anticipated Legendary Pokémon to catch. This is despite its snafu at Pokémon Go Fest, a celebratory event on July 22 that went sideways when 20,000 attendees couldn’t play the game because of technical issues.

Niantic has kept up a steady drumbeat of in-game events and earlier this year launched an overhaul of the gym battle system. These efforts have maintained the attention of core players, but it looks like the Legendary Pokémon have drawn the most interest. Sensor Tower found that Pokémon Go is now No. 1 in the Apple App Store top-grossing chart in 23 countries including the U.S.

Last month, Pokémon Go passed $1.2 billion revenue. If it keeps rolling out content with high demand, we might see it reach another milestone.

Correction, 10:43 a.m., Pacific: The $5.8 million is for both Apple App Store and Google Play, not just iOS.

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