Dr. Mario World will be shut down by Nintendo this November, after little more than two years of service.
The mobile match-3 puzzler launched in July 2019 and has been kept well updated with new stages and characters. But in-game purchases have now been switched off, and the game will become completely unplayable from 1st November.
After that date, Nintendo says it will memorialise the game and your play history via "Dr. Mario World Memories", a web page it will put up after pulling the game down.