Each playable character has their own set of combos and attributes. After the end of each level the player can upgrade their characters' abilities and combos using experience points. The number of points available to the player depends on the efficiency of their kills. During each level, the player will be continually graded on the skill with which they dispatch enemies; "Fair", "Good", "Excellent" and "Perfect." The more skill with which the player kills, the more experience they acquire. The player's skill is measured by an on-screen meter which increases as the player dispatches enemies. To avoid the meter dropping back down, the player must avoid being hit, and kill enemies using a variety of different methods. When a player reaches a Perfect level, all of their attacks increase in strength, and the experience from each kill is doubled. However, Perfect status only lasts for a brief period of time.