When not in battle, the player has the option of altering the weapon and armor attributes and effects with tools and super-tools, which are limited in number. The player selects the "tune-up" option, choosing the weapon that will be altered and the weapon from which the attributes or effect will be taken. Weapons have many different properties, including special effects like "acid", which causes enemies to continuously take damage. One of the principal RPG elements of the game is that experience-based levels are present. Each time the player's level increases, his/her attributes go up and BP (Bonus Points) are given. These points can be distributed to the ATB, item capacity, or attributes of a weapon or armor.