Players must traverse various battlefields and destroy a requisite number of specific enemy types in order to proceed to the end-level boss. Players can collect a large amount of weapons, but can only equip and use two at a time. Players can also equip a primary weapon to the NAP's arm and a side weapon attached to the NAP's back. Doing so unleashes one of two different variations of attack the weapon offers, but if the NAP suit is too heavily damaged, most of the weapons the player has collected previously will be lost, as well as the use of their side weapon.