 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 's objective is to destroy the viruses populating the on @-@ screen playing field by using 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 . 
