Multiple (Copy files to saved game directory. Load the LeonB_06_Train.RESIDENT2 file and successfully complete the game to unlock The 4th Survivor and Extreme Battle modes, under the "Special Option" selection of the main menu.)

ada1_01_monitor_room.resident2 (Play as Ada Wong with unlimited ammunition)

chris1_01_monitor_room.resident2 (Play as Chris Redfield with unlimited ammunition)