Dr. Mario World was a 2019 match-three mobile game developed and published by Nintendo in collaboration with Line Corporation and NHN Entertainment. Nintendo officially announced on July 28, 2021 that the Dr. Mario World service would end on November 1, 2021 at 2 AM North American Eastern Standard Time. The game was shut down at 2 AM North American Eastern Standard Time with no reasons specified, rendering the game completely unplayable.