Levels consist of a single plane, and are viewed isometrically. They are filled with enemies of various types, which attempt to harm the Kid.[1] The Kid carries two weapons, which may be selected from the choices available to the player at specific locations called arsenals.[2] The Kid also has the ability to perform a special attack. Weapons and special attacks must be acquired before they can be used.[1] There are a limited number of special attacks that the player can perform at any time, represented by "black tonics" that can be found in the levels or dropped from enemies.