Dr. Mario World would be launching worldwide (excluding some specific countries/regions) on July 10th, 2019, Nintendo revealed via a Tweet as the developer and publisher of the game. Moreover, the company has opened an official website ¹ including some new promotion materials. Dr. Mario World will be playable on any device operated by either iOS (Apple) or Android (Google). The game follows free-to-play with in-app purchases business model. The estimated price for in-game sale packs are ranged from $1.99 up to $69.99, however there is no confirmation if gacha system which is also known as loot box is existed or not.
1) The currency mentioned in this post is US Dollar, however it may vary based on country/region, hence there are some cases where currency exchange fee charge are required
2) The game is under development, therefore images and contents may vary in the final product