Dr. Mario is a 1990 Mario action puzzle video game designed by Gunpei Yokoi and produced by Takahiro Harada. The game's soundtrack was composed by Hirokazu Tanaka. The game focuses on the player character Mario, who assumes the role of a doctor and is tasked with eradicating deadly viruses. In this falling block puzzle game, the player is tasked with destroying the viruses populating the on-screen playing field with the use of colored capsules that are dropped into the field. The player manipulates the capsules as they fall so that they are aligned with viruses of matching colors, which removes them from play. The player progresses through the game by eliminating all the viruses on the screen in each level.