The game, titled "Dr. Mario World" will be released early summer this year according to a statement released by the company.
Several developers and manufacturers would have been already informed about the existence of the project.
Just days after announcing plans to delay Mario Kart Tour on iOS and Android, Nintendo has unveiled a brand new mobile game for this summer.
They might also be anxious about how this classic insane racing franchise will play on a phone. Nintendo launched its Switch Online subscription service last September. And as The Verge points out, Mario and Zelda creator Shigeru Miyamoto once reminded us, "A delayed game is eventually good, but a rushed game is forever bad".
The Japanese company can usually count on their fans loyalty to their products and so no doubt the game will sell well when it's finally released. They said Nintendo hasn't fully taken advantage of that to get people to buy the Switch, a hybrid game machine that works both as a console and a tablet that went on sale two years ago.
Games like Fire Emblem Heroes and Dragalia Lost have been relatively well received. That in itself brings problems, as you'd lose compatibility with games that require single Joy-con controls, like Super Mario Party.