Throughout the game, players can also change their abilities, looks by mutations and bio-mechanical body parts such as attaching robotic legs, wings and claws which can be used to get various advantages against certain enemies or at certain locations. In order to reach specific areas, the player must change body parts, equip gear that is suited for that area, or obtain specific vehicles, such as an air balloon or jet skis. This way, the player can overcome obstacles introduced by their surroundings, such as the limited oxygen availability in Death Zone: by wearing a gas mask or an oxygen container, the player is able to venture deeper into the area and explore new places that cannot be reached without any precautions, while an even bigger part of the area can be reached by obtaining a mech.[1][5] The game's world can be seamlessly explored by the player on foot, by flying or using an air balloon, jet ski and mech.