All characters:
Press [Right] [Left] [Left] [Right] [Up] [Up][Up] [Esc] at the character selection screen at an Xtraction point where you usually save the game or switch characters.

All skins:
Press [Down] [Up] [Left] [Right] [Up] [Up] [Esc] at the team management screen.

OUR RATING FOR THIS GAME: 

(5 is best)