Mega Man 10 takes place in the 21st century, in which a disease called Roboenza begins infecting and disabling robots, hampering daily life for humans. The disease eventually causes many of the robots to malfunction and attempt to take over the world. The evil scientist Dr. Wily seeks help from the hero Mega Man. Wily states that a machine he devised, capable of finding a cure for the illness, is stolen by an infected robot. Mega Man decides to retrieve the machine; his brother and ally, Proto Man, decides to join him. Mega Man 10 is a traditional 2D side-scrolling game with action and platforming elements. Taking control of either Mega Man or Proto Man, the player must clear a set of eight stages. Destroying each stage's Robot Master boss adds its special weapon to the player's arsenal. Downloadable content, including extra stages and Bass as a third playable character, has been made available.