Rib cage
The rib cage is the arrangement of ribs attached to the vertebral column and sternum in the thorax of most vertebrates, that encloses and protects the heart and lungs. In humans, the rib cage, also known as the thoracic cage, is a bony and cartilaginous structure which surrounds the thoracic cavity and supports the shoulder girdle to form the core part of the human skeleton. A typical human rib cage consists of 24 ribs in 12 pairs, the sternum and xiphoid process, the costal cartilages, and the 12 thoracic vertebrae.
Cubivore: Survival of the Fittest
Less essential than mutations are limbs. Limbs are lost when torn off in combat, resulting in a mutation of whatever has torn off the appendage. A Cubivore with missing limbs can regain them by eating limbs from other Cubivores. Every generation of a Cubivore will have one more limb than its parent generation. Each limb can hold one color, one Raw Meat, and allows the Cubivore to attack stronger enemies. For example, a Cubivore with one limb can attack one with up to two limbs, while a Cubivore with two limbs can attack one with up to three limbs.