Hearthstone is the most-downloaded iPad app in 16 regions — including the U.S.

Blizzard has never done mobile before — but this isn’t stopping its first game from dominating the charts.

The publisher’s online card battler Hearthstone: Heroes of Warcraft is the most-downloaded iPad game in the U.S. It also tops that charts in Brazil, Russia, Hong Kong, and 12 other countries, according to analytics-tracking firm App Annie. This rush to the top comes after less than 24 hours of availability. It previously launched on iPad in Canada, New Zealand, and Australia earlier this month before making its worldwide debut yesterday.