Dr. Mario is a falling block tile-matching video game.[13] Mario assumes the role of a doctor, tossing two-colored medical capsules into a medicine bottle representing the playing field. This area is populated by viruses of three colors – red, yellow, and blue – which stay in their starting positions until removed. In a style similar to Tetris,[14] the player manipulates each capsule as it vertically falls, able to move it left or right and rotate it 90 degrees clockwise or counter-clockwise. When matching colors of capsule halves and viruses touch sequentially 4-in-a-row, they disappear. Any remaining half or whole capsules which are not supported will fall to the bottom of the playing field or until hitting another supported object, and any new 4-in-a-row alignments also disappear. The main objective is to eliminate all viruses from the playing field, finishing each level. A game over occurs if capsules fill the playing field in a way that obstructs the bottle's narrow neck. After each 5th level is completed on Medium or High difficulty, up to level 20, a cutscene shows the virus trio sitting on a tree as music plays and an object flies across the screen.[15]