Level Skip and Weapon Power-Up

Pause the game and enter any of the following cheats. Level Skip: Quickly press and hold L2 and press Up, Down, Left, Right, Tri, X, X, Tri, Right, Left, Down, Up. While still holding L2, unpause the game.
Weapon Power-Up: Quickly press and hold L2 and press Up, Down, Left, Right, Tri, X, Square. While still holding L2, unpause the game.