The main objective of the entire game is to engage in battle with other robos, and finish its plot by collecting every custom robo, battle part, and item that the player wants, while winning every battle that moves you from one part of the storyline to the next.
Before battling begins, players customize their robos from 5 types of parts: the chassis (the robo itself), the gun (right hand), the bomb (left hand), the pod (backpack), and the legs (attachments to your legs and feet).