Dr. Mario World

In Dr. Mario World, and similar to prior Dr. Mario games, the player removed viruses from the screen by matching their colors with that of a pill capsule. The player oriented a single pill capsule against an array of viruses and obstacles.

As the pill began to drift upwards, the player could rotate and horizontally move the pill such that, when settled, the pill's color would match at least two similarly colored viruses in a vertical or horizontal direction. The level was complete when all viruses are removed.

Nintendo announced the game on February 1, 2019, with a planned release for early summer of that year. It was eventually released for Android and iOS mobile platforms in 59 territories on July 9, 2019. In July 2020, to celebrate the 30th anniversary of the original Dr. Mario game for the NES, a 8-bit sprite of Dr. Mario was released as a playable character.

In July 2021, Nintendo announced that they would be shutting down Dr. Mario World in November of the same year, with diamond packs no longer available for purchase from that date onwards. After October 31, 2021, opening the game displays a message saying that the service has shut down. A website entitled Dr. Mario World Memories was then created to view player progress before the game was shut down.

Dr. Mario World received "mixed or average reviews", according to review aggregator website Metacritic. Polygon reported not feeling forced to spend real money through the game's monetization mechanics. Destructoid also criticized the monetization model, writing, "It's a shame Nintendo cut and ran with microtransactions after one misstep, their first, no less, in the mobile market."

75 out of 10. Nintendo Life called the title "a game of two halves", heavily praising the multiplayer component while criticizing issues present in the single-player mode.