Mario World is a puzzle game based on the well-known Dr.

Players are tasked with matching capsules with viruses in order to clear out all the viruses on the board, and Nintendo characters like Peach, Bowser, Koopa Troopa, and Goomba appear in the game.

Mario World is a free-to-play game that included optional in-app purchases, but apparently the game failed to catch on.

Nintendo has had success with games like Fire Emblem Heroes and Dragalia Lost, but has not been able to maintain sales momentum.