Agility Power-Up
     When  your  adrenaline  reaches  100  and it flashes, press Down,
Down, Up, Up.

Regeneration Power-Up
     When  your  adrenaline  reaches  100  and it flashes, press Down,
Down, Down, Down.

Invisibility Power-Up
     When  your  adrenaline  reaches  100 and it flashes, press Right,
Right, Left, Left.

Berserk Power-Up
     When your adrenaline reaches 100 and it flashes, press Up, Up, 
Up, Up.