A sequel to the PlayStation robot battle game known for its requirement that you both build up your mech physically and program its AI. You first start out by building the physical side of your mech, mixing and matching parts from 30 pre-designed mechanical beasts and even editing your own emblem. Once you're satisfied with how things look on the outside, you head on inside, creating movement patterns for your mech by placing special move chips in slots on the mech's CPU. You're free to test your mech out in a test battle, and can make changes if you're unhappy with the result. You don't actually fight battles directly in Carnage Heart Portable. Instead, you create a team of three robots, which then heads off to do automatic warfare against enemies.