The power of Mega Man's main weapon, the Buster Gun, depends on the Buster Parts equipped. Buster Parts can be equipped to upgrade four stats of the Buster Gun; Attack (how strong it is), Rapid (how fast it fires), Range (how far the shots go), and Energy (how many shots can be fired before pausing). Buster Parts can be retrieved from stores or from dungeons. Additionally, Roll is able to create Buster Parts from unusable objects found in the ruins. Roll is also able to make weapons for the player, using specific combinations of parts that can be found in dungeons or bought in shops. Many of these weapons supplement the Buster Gun. The only way to refill them in the field is an item that can be bought, but only one can be carried. Only one special weapon can be equipped at a time, and the only way to switch is to talk to Roll, unlike the original series. Special weapons can be upgraded, and have five stats; Attack, Rapid, Range, Energy, and Special. In order to upgrade them, the player must pay a specific amount of Zenny.