The player assumes the role of a mercenary for hire, picking which side they would like to work for. They are then given a mech and equipped with the most advanced weaponry and must complete missions in an attempt to win battles and ultimately win the war for their side.
The gameplay consists of traveling through levels, destroying various enemies and completing certain objectives that include attacking certain enemies, protecting allies or acquire technology. Players must also battle huge mech bosses in order to advance to other levels and can also customize their mech in a various amount of ways, ranging from color, weapons, etc. The viewpoint is from behind the player, using the analog stick to move the camera and view the surrounding area.