Beat the game on any difficulty setting with any character. Then go to the profile section and select the character you beat the game with. Their profile will be available, along with their Rigging Model. You can use the Rigging Model in game, by selecting it through the Profile.
10/25/2004
Extra Stages
Beat a set amount of Missions in Challenge Mode to unlock 4 additional Hidden Stages. Missions do not have to be beaten in any set order, or consecutively.