You dont realy play as raiden but you do have a mask in the face paint menue that makes you look just like him. In MGS3 raiden is actually called Ivan Raikov. You have to kill him and take his uniform. You start with the mask at the beginning.
[Edited by moderator Chichay, 12/21/2004 6:46:34 PM]
You dont kill him you have to K.O him.