Instructions
Select a character that you have played with enough to have reached Level 10. Your first characters will have reached Level 10 around the time you reach Arcade's Murderworld.
Build up momentum by performing combo attacks against enemies. Combo attacks are melee attacks strung together in succession, such as Attack, Attack, and Smash for a Knock-Up Combo.
Collect momentum orbs by breaking open containers or defeating enemies.
Hold down the "Right Trigger" button and press the "Y" button when your momentum meter is full to perform your extreme power. Any other characters with an extreme power equipped and a full momentum meter will also perform his attack automatically.