Beast Wars: Transformers Codes -

Weapon power-up:
Pause game play, then hold L2 and quickly press Up, Down, Left, Right, Triangle, X, Square. Release L2, then immediately press Start to resume game play.

Level skip:
Pause game play, then hold L2 and quickly press Up, Down, Left, Right, Triangle, X(2), Triangle, Right, Left, Down, Up. Release L2, then immediately press Start to resume game play.