Level Select option:
Complete the game successfully two times to unlock the Level Seletct option
Press the following combination at the Game Selection screen in Story mode:
L, X, R, R, Black, X, L, R, Black
While playing a game, press the following combination:
Up, Up, Up, Up, Up, Up, Down, Right, Up
To unlock the Custom option at the Battle Mode Team Setup menu get 100% hit head shot status two times in a row.
Team Power option:
To unlock the Team Power option at the Battle Mode menu get two head shots in a row.